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 32975 = -0*r + 5*r. Suppose 5*k - i = 3*i - 6596, 5*i - r = 5*k. Let o = k + 7877/6. Find the common denominator of o and -39/10.
Example Output: 30

Example Input: Let p(s) = -s**2 - 5*s - 1. Let y be p(-5). What is the tens digit of y - (-2 + -11*2)?
Example Output: 2

Example Input: Four letters picked without replacement from zczcuzuzuzccuzzcc. Give prob of picking 4 c.
Example Output:
3/476