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).

Input: Consider Input: Solve 0 = -4*v + 2*z + 18, 4 = 3*v + z - 7 for v.

Output: 4


Input: Consider Input: What is next in -567, -578, -605, -654, -731?

Output: -842


Input: Consider Input: Solve 2*j - 2 = 8*c - 10*c, -4*c + 2 = 5*j for j.


Output: -2