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:
Calculate prob of sequence pd when two letters picked without replacement from {d: 2, c: 1, m: 2, p: 2, z: 1}.

Ex Output:
1/14


Ex Input:
Suppose 2*y + 12 = 6*y. Suppose y = f - 15. Solve -8 = -4*w, -3*d - 4*w + f = -8*d for d.

Ex Output:
-2


Ex Input:
Let j(h) be the second derivative of -h**3 - 3*h. Let d be j(-3). Let i(z) = z**2 + 4*z + 1. Let u be i(-5). Calculate the highest common factor of u and d.

Ex Output:

6