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:
Let s = 11 + -3. Solve -y - s = y for y.

Ex Output:
-4


Ex Input:
Four letters picked without replacement from aaaafaffaaafaa. What is prob of sequence fafa?

Ex Output:
45/1001


Ex Input:
What is next in 40, 52, 72, 100, 136?

Ex Output:

180