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 a(g) = g**3 - 2*g**2 + g - 2. Let v be a(3). Let x = v + 15. What is the units digit of x?
Example Output: 5

Example Input: Solve -189 = -7*k - 133 for k.
Example Output: 8

Example Input: Calculate prob of picking 1 h and 1 o when two letters picked without replacement from {o: 3, e: 2, h: 10, r: 4}.
Example Output:
10/57