What is 18 minus a negative 18?

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Since minus a negative is the same as a plus, then 18 - (-18) is the same as 18+18 = 36
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How do you do negative 18 minus 36?

18-36=-18 * * * * * That is 18 minus 36. But the question was about negative 18 minus 36. The answer to the question is -18 - 36 = -54