TASK DEFINITION: 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).
PROBLEM: Sum 259 and -46.

SOLUTION: 213

PROBLEM: ((-20)/10)/(8/(-4))

SOLUTION: 1

PROBLEM: Suppose 9*v + 5*v = 140. Solve 0*a + v = -2*a for a.

SOLUTION:
-5