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: Solve 56 - 20 = -3*i - 4*w, 5*i + 4*w = -44 for i.
Example Output: -4

Example Input: Three letters picked without replacement from {e: 4, z: 1, r: 9}. What is prob of picking 3 r?
Example Output: 3/13

Example Input: Let c = 10 - 8. Solve p + c*p = 0 for p.
Example Output:
0