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).

Ex Input:
Solve 0 = 3*f - 2*x - 11, 0 = 2*x - 7*x - 5 for f.

Ex Output:
3


Ex Input:
What comes next: -18, -32, -60, -108, -182, -288, -432, -620?

Ex Output:
-858


Ex Input:
What is 607.907 millilitres in litres?

Ex Output:

0.607907