### Task:

Your job is to take a pair of parametric equations, passed in as strings, and convert them into a single rectangular equation by eliminating the parameter. Both parametric halves will represent linear equations of x as a function of time and y as a function of time respectively. 

The format of the final equation must be `Ax + By = C` or `Ax - By = C` where A and B must be positive and A, B, and C are integers. The final equation also needs to have the lowest possible whole coefficients. Omit coefficients equal to one.

The method is called `para_to_rect` or `EquationsManager.paraToRect` and takes in two strings in the form `x = at +(or -) b` and `y = ct +(or -) d` respectively, where `a` and `c` must be integers, and `b` and `d` must be positive integers. If `a` or `c` is omitted, the coefficient of _t_ is obviously assumed to be 1 (see final case in the example tests). There will NEVER be double signs in the equations inputted (For example: `"x = -12t + -18"` and `"y = -12t - -18"` won't show up.)

### Examples:

```python
para_to_rect("x = 12t + 18", "y = 8t + 7") => "2x - 3y = 15"
```

> __CALCULATION:__  
  x = 12t + 18  
  y = 8t + 7  
  2x = 24t + 36  
  3y = 24t + 21  
  2x - 3y = (24t + 36) - (24t + 21)  
  2x - 3y = 15  

```python
para_to_rect("x = -12t - 18", "y = 8t + 7") => "2x + 3y = -15"
```

> __CALCULATION:__  
  x = -12t - 18  
  y = 8t + 7  
  2x = -24t - 36  
  3y = 24t + 21  
  2x + 3y = (-24t - 36) + (24t + 21)  
  2x + 3y = -15  

```python
para_to_rect("x = -t + 12", "y = 12t - 1") => "12x + y = 143"
```

> __CALCULATION:__  
  x = -t + 12  
  y = 12t - 1  
  12x = -12t + 144  
  y   = 12t  - 1  
  12x + y = 143  

More examples in the sample test cases.

### Notes:

As you can see above, sometimes you'll need to add the two parametric equations after multiplying by the necessary values; sometimes you'll need to subtract them – just get rid of the _t_!

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

def _disabled_input(*args, **kwargs):
    raise RuntimeError("input() is disabled in callable mode")
builtins.input = _disabled_input

ns = {"__name__": "__judge__"}  # prevent if __name__ == "__main__" blocks
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = "def gcd(x,y):\n    while y:\n        x,y=y,x%y\n    return x\n    \ndef parseeq(s):\n    s=s.split()\n    a=s[2].replace('t','')\n    if a=='': a=1\n    elif a=='-': a=-1\n    else: a=int(a)\n    try:\n        b=int(s[3]+s[4])\n    except:\n        b=0\n    return a,b\n\ndef para_to_rect(eqn1, eqn2):\n    a,b=parseeq(eqn1)\n    c,d=parseeq(eqn2)\n    e=b*c-a*d\n    if c<0: a,c,e = -a,-c,-e\n    g=gcd(a,gcd(abs(c),abs(e)))\n    a,c,e=a//g,c//g,e//g\n    sign='+-'[a>0]\n    if c==1: p1=''\n    elif c=='-1': p1='-'\n    else: p1=c\n    if a==1: p2=''\n    elif a==-1: p2=''\n    else: p2=abs(a)\n    \n    return '{}x {} {}y = {}'.format(p1,sign,p2,e)\n    \n    \n"
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

_target = None
_fn_name = 'para_to_rect'
if _fn_name:
    if "Solution" in ns:
        try:
            _obj = ns["Solution"]()
            if hasattr(_obj, _fn_name):
                _target = getattr(_obj, _fn_name)
        except Exception:
            _target = None
    if _target is None and _fn_name in ns and callable(ns[_fn_name]):
        _target = ns[_fn_name]
# Fallback: if there's exactly one user-defined function, use it
if _target is None:
    _cands = [v for k, v in ns.items() if callable(v) and getattr(v, "__module__", "") in ("__judge__", "__main__")]
    _user_funcs = [c for c in _cands if getattr(c, "__name__", "").startswith("_") is False]
    if len(_user_funcs) == 1:
        _target = _user_funcs[0]
if _target is None:
    raise RuntimeError(f"Could not resolve callable '{_fn_name}'")

_raw = sys.stdin.read().strip()
if _raw:
    _parsed = json.loads(_raw)
    if isinstance(_parsed, dict):
        _kwargs = _parsed.get("kwargs", {})
        _args = _parsed.get("args", [])
    else:
        _args, _kwargs = _parsed, {}
else:
    _args, _kwargs = [], {}
if not isinstance(_args, (list, tuple)):
    _args = [_args]
_res = _target(*_args, **_kwargs)
try:
    sys.stdout.write(repr(_res) + "\n")
except Exception:
    pass

```

Measured memory_bytes: 6177