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 0*m - m - 3 = 0. Let i = m - -7. Solve -v = -0*v + i for v.

A: -4
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Q: What is the product of -4 and -42?

A: 168
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Q: Let a be (-155)/20 + (-2)/8. Let y = -1 - a. What is the units digit of y?

A:
7
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