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).

What is next in -262, -266, -270, -274, -278, -282?
-286

What comes next: -37, -72, -129, -220, -357, -552, -817?
-1164

Let y = 13 + -13. Suppose 5*n + 5*h = 215, -5*n + y*h = -5*h - 235. Calculate the greatest common divisor of n and 9.

9