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).

Calculate -0.4 - 4148.
-4148.4

Solve -3*w - 4 = -h - 8*w, 4*h = -2*w - 2 for h.
-1

Suppose 4*b = 2*x - 22, 5*b = x - 0 - 20. Suppose 0 = -3*v - 21*v + 24. Solve -3*o - u = -5, -2*u = x*o + 2*u + v for o.

3