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: Evaluate -35 + 38 - (3 - (2 + -3)).

Answer: -1


Question: -4*80.8

Answer: -323.2


Question: Let o = -6 - -11. Suppose 3*c + 3*h + o = -1, 4*h = -20. What is the units digit of c?

Answer:
3