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).
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Question: Suppose 56 = 113*r - 109*r. Let z = 22 - 10. Calculate the smallest common multiple of z and r.

Answer: 84


Question: Suppose -2*u + 2*o + 60 = 0, 4*u + 0*o = -5*o + 102. Calculate the highest common divisor of u and 42.

Answer: 14


Question: Let n = 17 - 12. Suppose -4*t + h = 48, -h + 24 = -n*t - 37. Let b = t + 21. What is the units digit of b?

Answer:
8


