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).

Input: Consider Input: What is prob of picking 1 u and 3 f when four letters picked without replacement from wfffsmfwu?

Output: 2/63


Input: Consider Input: Solve 3*x = t + 11, 2*x = 3*x + 4*t - 21 for x.

Output: 5


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


Output: -5