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: What is prob of sequence kcv when three letters picked without replacement from kkkckvknnknvkn?
Example Output: 1/156

Example Input: Convert 0.0206712 weeks to microseconds.
Example Output: 12501941760

Example Input: Let r be 4 + (-18)/3 - -4. Solve r*n + 5 + 1 = 0 for n.
Example Output:
-3