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).

[Q]: Suppose a - 6*a + 3*j + 321 = 0, -342 = -5*a - 4*j. What is the greatest common divisor of 165 and a?
[A]: 33


[Q]: Solve -4*f = 3*o - 3 + 4, 2*o - 3*f - 5 = 0 for o.
[A]: 1


[Q]: Let q = -13061612/3 - -4401485. Let v = q + -49250. Let b = v - -1615. Find the common denominator of b and -1/7.
[A]:
21