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: Suppose -6 = -t - 2*t. Suppose 4*h - 10 = -t*r, -h - 3*h + 3*r + 5 = 0. Suppose 19 + 15 = h*g. What is the greatest common divisor of g and 153?
Example Output: 17

Example Input: Four letters picked without replacement from {t: 6, e: 2}. What is prob of picking 4 t?
Example Output: 3/14

Example Input: What is the next term in 11, 35, 59, 83?
Example Output:
107