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A polynomial of degree zero is a constant term

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Q: Simplify this expression 13 plus - 12 minus -5 equals?
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Simplify this expression 13 plus minus 12 minus minus 5 equals?


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Plus minus negative equals plus + plus because the negatives cancel out.

What is a plus equals plus plus a minus minus minus a?

Your question does not make sense. It would probably be interpreted as a + = ++a ---a