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: Solve -182 = -4*z - 194, -2*a + 2*z + 4 = 0 for a.
Example Output: -1

Example Input: What is twenty-three sevenths of a week in hours?
Example Output: 552

Example Input: Suppose -l + 7 + 13 = -3*t, 2*t = 2*l - 20. Let v = 18 - t. What is the tens digit of v?
Example Output:
2