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 Q]: Solve -4*f = 3*o - 3 + 4, 2*o - 3*f - 5 = 0 for o.
[EX A]: 1

[EX Q]: Suppose 2*w - 3*h + 5 = 2*h, -h = 4*w - 1. Suppose w = 3*j - 9, -z + 17 = 5*j + 2. Suppose -3*n + 62 - 23 = z. What is the greatest common divisor of n and 117?
[EX A]: 13

[EX Q]: What is prob of picking 1 e and 1 h when two letters picked without replacement from {h: 4, u: 5, b: 2, e: 2}?
[EX A]:
4/39