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:
What is next in 30, 29, 26, 21, 14, 5?

Ex Output:
-6


Ex Input:
Two letters picked without replacement from vvdv. Give prob of sequence vv.

Ex Output:
1/2


Ex Input:
Calculate 9/(6/2)*(-6)/18.

Ex Output:

-1