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 8 divided by -5?
-8/5

Calculate prob of sequence dqd when three letters picked without replacement from fqfuurdttdft.
1/660

Let x = 27 + -5. Let n = 24 - 9. Let q = x - n. Solve 2*f - s = -13, -3*f + q*f + 36 = 4*s for f.

-4