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:
Suppose 0*r = 5*r - 35. What is the units digit of r?

Ex Output:
7


Ex Input:
Solve -2*i = -4*x + 1 - 17, 5*i = 5*x + 20 for i.

Ex Output:
0


Ex Input:
How many days are there in 3.7373391 minutes?

Ex Output:

0.002595374375