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]: What is 7/2*24/28?
[A]: 3


[Q]: Suppose g + x - 9 = 0, -30 = -5*g + x - 9. Solve 4 - 9 = -g*h for h.
[A]: 1


[Q]: Let c(r) be the second derivative of -r**5/20 + r**4 - r**3/6 + 15*r**2/2 - 2*r. Let g be c(12). Solve -5*p = 3*o + 13, -6*p - 11 = 5*o - g*p for o.
[A]:
-1