instruction:
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).
question:
Let l = 1 + 7. Solve 4 + l = 3*s for s.
answer:
4


question:
Solve -5*k + 2*k + 2*k = 0 for k.
answer:
0


question:
Let w(d) be the first derivative of d**4/4 + d**3/3 - 9. Let o be (1 + 1)*3/6. What is the units digit of w(o)?
answer:

2