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: Let q = 14 - 24. Let z = q + 21. Solve -z = 2*c - 1 for c.
Example Output: -5

Example Input: Three letters picked without replacement from {e: 6, k: 1, f: 5, o: 7}. What is prob of picking 1 o and 2 e?
Example Output: 35/323

Example Input: Suppose -5*g + 4*r - 114 = -774, 0 = -2*g - 3*r + 287. What is the highest common divisor of g and 17?
Example Output:
17