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).

Example Input: 3 - (-4 + 4 + 2)
Example Output: 1

Example Input: What is prob of picking 1 c and 1 b when two letters picked without replacement from bbbbbbbbbbbbbbccbb?
Example Output: 32/153

Example Input: Let u = 4 + -5. Let w(j) = 6*j**2 + j. Let b be w(u). Suppose 0 = 6*v - v, -b*o - 4*v + 65 = 0. What is the highest common divisor of 39 and o?
Example Output:
13