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 1/5 of a millennium in centuries?
2

In base 10, what is -151 - 26?
-177

Let i(f) = -4*f**2 - 2*f - 1. Let n = 5 + -6. Let x be i(n). Let s(v) = v**2 + 4*v + 4. Let j be s(x). Solve j = -4*u - 3 for u.

-1