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).

Input: Consider Input: Solve -5*i - 5*r - 50 = 0, -r + 5 = -4*i - 10 for i.

Output: -5


Input: Consider Input: ((-57)/(-456))/((-3)/(-8))

Output: 1/3


Input: Consider Input: Suppose -o = 4*o - 5*r - 80, 0 = -2*o - 5*r + 25. Let z = 9 - o. Find the common denominator of z*(-3)/12*9 and -33/4.


Output: 4