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: Two letters picked without replacement from {u: 2, x: 8}. Give prob of picking 1 x and 1 u.
Example Output: 16/45

Example Input: Solve -8*j + 429 - 405 = 0 for j.
Example Output: 3

Example Input: Let g(d) = d**2 - 7*d + 4. Let f be g(7). Let v = 40 - 26. Suppose -f*p + 2 = -v. What is the units digit of p?
Example Output:
4