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: In base 14, what is 2 - -129?

Output: 12b


Input: Consider Input: What is next in -154, -164, -180, -202?

Output: -230


Input: Consider Input: Calculate prob of sequence xffg when four letters picked without replacement from {g: 8, f: 4, x: 4}.


Output: 4/455