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 5*c = 3*z - 31, 0*c + c + 7 = z for c.
Example Output: -5

Example Input: What is next in -567, -578, -605, -654, -731?
Example Output: -842

Example Input: What is prob of sequence kd when two letters picked without replacement from {f: 1, d: 1, m: 4, a: 1, k: 1}?
Example Output:
1/56