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 -2*u + 2*o + 60 = 0, 4*u + 0*o = -5*o + 102. Calculate the highest common divisor of u and 42.
[A]: 14


[Q]: Suppose -16 = l - 18. Solve -4*h + l*h = 0 for h.
[A]: 0


[Q]: Suppose -2*b - 9 = 21. Let f be (-1)/5 - 63/b. Suppose 3*t - 2*p - 11 = 0, 8*p - 4*p + 8 = f*t. What is the units digit of t?
[A]:
7