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 d = -25 - -162. What is the tens digit of d?

Ex Output:
3


Ex Input:
Calculate prob of sequence kkhh when four letters picked without replacement from khhhhkhhkhhhkkhhhh.

Ex Output:
13/306


Ex Input:
Solve u + 8 = 5*u for u.

Ex Output:

2