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+15 - (-3) = 15 + 3 = 18
Negative 18 minus positive 12 is negative 30.
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
-15 - (-15) = 0
-18 minus 9 is -27