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 c = 4 - 2. Suppose 0 = n + c*n - u - 27, -3*n + 18 = 2*u. Suppose 3*p - n = 4. Solve 0 = 3*w - p - 2 for w.
Example Output: 2

Example Input: Suppose i = w - 15 + 48, -100 = -4*i - 4*w. Let f = -3 + -4. Let k be (-9 - -1)/(5 + f). Solve -4*h - k*v = v - i, 0 = -5*h + 4*v - 15 for h.
Example Output: 1

Example Input: Calculate prob of picking 2 g when two letters picked without replacement from {g: 5}.
Example Output:
1