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:
Solve 5*c = 3*z - 31, 0*c + c + 7 = z for c.

Ex Output:
-5


Ex Input:
What is the next term in -27, -51, -75?

Ex Output:

-99