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 be (4 + -6)*1/2. Let u be (-15)/(-6)*(-2)/f. Suppose 35 = 2*m - u*g, -5*m + 0*g = 3*g - 72. What is the tens digit of m?
Example Output: 1

Example Input: Let o be -12*-2*(-3)/(-24). What is the highest common factor of o and 33?
Example Output: 3

Example Input: Four letters picked without replacement from aahgh. Give prob of sequence agga.
Example Output:
0