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).

Ex Input:
Suppose -27 = g - 70. What is the units digit of g?

Ex Output:
3


Ex Input:
Solve 0 = 3*v - 3*m - 8 + 5, -5*v - 2*m = -19 for v.

Ex Output:
3


Ex Input:
Suppose 4 = -b + 9. Suppose 0 = 5*v + i - 4, 0 = 4*v + 5*i - 9*i + 16. Solve v = -2*s, 0 = -f - 4*s + b for f.

Ex Output:

5