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: What is 0 + 5 - 15 - -5?

SOLUTION: -5

PROBLEM: 0.3539 - 5

SOLUTION: -4.6461

PROBLEM: Let g = 6 + -1. Suppose -3*r + g*r = 22. What is the highest common divisor of r and 1?

SOLUTION:
1