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 5 = -3*r - 4. Let b(f) = 3*f**2 + 2*f - 3. Let c be b(r). Calculate the highest common divisor of c and 6.

Ex Output:
6


Ex Input:
What is prob of sequence dd when two letters picked without replacement from uddudd?

Ex Output:
2/5


Ex Input:
Suppose 3*t - t - 4 = 0. Let g(q) = 4*q**3 + q**2 - 2*q + 1. Let r be g(1). Suppose 30 = r*c - t. Solve c*i - 3*i = 20 for i.

Ex Output:

4