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: Suppose -3*n + 16 = -d, 0*n - 5*d = 3*n - 10. Let k = n + -3. Suppose 0 = k*g - g - 14. What is the greatest common factor of 28 and g?
Example Output: 14

Example Input: What is prob of picking 4 z when four letters picked without replacement from {y: 3, z: 4, b: 13}?
Example Output: 1/4845

Example Input: Solve 3*z + 6 = -5*o, 8 = 8*z - 12*z for o.
Example Output:
0