instruction:
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).
question:
Solve 23*o = 21*o - 4*u + 18, 4*o - 2*u + 14 = 0 for o.
answer:
-1


question:
Let u(w) be the first derivative of -w**2/2 + 9*w - 1. What is the lowest common multiple of u(8) and 6?
answer:
6


question:
Suppose 0*c = 3*c - 5*w - 11, -2*w - 2 = -2*c. Let x = 2 - c. What is the remainder when 19 is divided by x?
answer:

4