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 rkk when three letters picked without replacement from {r: 12, k: 3}.

Ex Output:
12/455


Ex Input:
Calculate prob of picking 2 n and 2 o when four letters picked without replacement from {o: 17, n: 3}.

Ex Output:
8/95


Ex Input:
Suppose 5*u + 2 = v + 2*u, 0 = -3*v - 4*u + 19. Suppose -5*h - 5*k = 0, 4*h - 6 = 2*k + 6. Solve 1 = 4*p + 3*r, h = v*p + 4*r + 1 for p.

Ex Output:

1