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: Let q = 14 - 24. Let z = q + 21. Solve -z = 2*c - 1 for c.
Example Output: -5

Example Input: Let w = -12 - -21. Let n = w + -5. Suppose 0 = -2*p + 6, 5*l - 38 = -0*l + n*p. Calculate the least common multiple of l and 5.
Example Output: 10

Example Input: Calculate prob of picking 1 w and 1 z when two letters picked without replacement from {z: 1, w: 2, s: 3, l: 4}.
Example Output:
2/45