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: What comes next: -18, -32, -60, -108, -182, -288, -432, -620?
Example Output: -858

Example Input: Solve -i + z + 1 = 0, 17 = 2*i - 7*z + 2*z for i.
Example Output: -4

Example Input: Calculate prob of picking 1 m, 1 n, and 1 a when three letters picked without replacement from {g: 1, u: 1, a: 1, m: 5, n: 3}.
Example Output:
1/11