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 comes next: -13616, -13610, -13602, -13592, -13580, -13566, -13550?
Example Output: -13532

Example Input: Two letters picked without replacement from dmmkpmkkkmmdqqkmpd. What is prob of picking 2 p?
Example Output: 1/153

Example Input: Solve 5*l + 21 = -5*m + 6*l, -5*l - 20 = 0 for m.
Example Output:
-5