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 f(c) = 53*c + 6. Let p be f(3). What is the highest common divisor of p and 15?
Example Output: 15

Example Input: What is the value of (-10)/10 - (-12)/6?
Example Output: 1

Example Input: In base 6, what is 2 + -223?
Example Output:
-221