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 = 10 - -75. Suppose 2*s = 2*t + 30, 5*s - q = s - t. Suppose -4*i + 4 + 5 = -a, 4*a - i = 24. Solve -s = -2*g + a*g for g.

Ex Output:
-4


Ex Input:
Let q = 14 - 24. Let z = q + 21. Solve -z = 2*c - 1 for c.

Ex Output:
-5


Ex Input:
100.7*0.5

Ex Output:

50.35