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).

Example Input: In base 10, what is -151 - 26?
Example Output: -177

Example Input: Two letters picked without replacement from {u: 2, x: 8}. Give prob of picking 1 x and 1 u.
Example Output: 16/45

Example Input: Calculate prob of sequence zzmz when four letters picked without replacement from {m: 13, z: 6}.
Example Output:
65/3876