Given a simple high-school level math question, you are required to solve it and provide the final answer. The final answer is always a single number. These questions can range from a variety of topics like simple arithmetic, solving equations, converting a quantity from one unit to another, finding remainders/GCD/LCM, finding probabilities etc. Each question has only one correct answer. This answer can be a positive or negative integer, a fraction or a decimal number. If the answer is a negative number use the hyphen (e.g. -42) symbol for the minus sign. For decimal numbers, do not add extra zeros after the decimal point. For fractional numbers, separate the numerator and denominator using a forward slash (e.g. 3/25).

Ex Input:
Let f(c) = 53*c + 6. Let p be f(3). What is the highest common divisor of p and 15?

Ex Output:
15


Ex Input:
Two letters picked without replacement from uuzzuuuuuuuuuzuu. Give prob of picking 1 u and 1 z.

Ex Output:
13/40


Ex Input:
Suppose -4*y + 19 - 3 = 0. Suppose 16 = -0*b + y*b. Calculate the lowest common multiple of b and 10.

Ex Output:

20