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 q be 2/4 - (-438)/4. Let b be 2/(-4) - (-21)/2. What is the greatest common divisor of q and b?

Ex Output:
10


Ex Input:
Four letters picked without replacement from wqwgwwdwgggqqwgdw. Give prob of sequence qgqw.

Ex Output:
1/272


Ex Input:
Evaluate (3 - 2) + -3 + -2.

Ex Output:

-4