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: Calculate prob of sequence nesl when four letters picked without replacement from {a: 1, v: 2, e: 2, n: 1, l: 1, s: 1}.

Output: 1/840


Input: Consider Input: Suppose -3*n + 16 = -d, 0*n - 5*d = 3*n - 10. Let k = n + -3. Suppose 0 = k*g - g - 14. What is the greatest common factor of 28 and g?

Output: 14


Input: Consider Input: Solve 0 = 5*f - 3*b - 10, 4*f + 2*b - 11 = 5*b for f.


Output: -1