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OpenStudy (anonymous):
Subtract: -18 – (-9) = -18 - +9 = -9 right
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OpenStudy (blurbendy):
the top would simplify to be - 18 + 9 = -9
OpenStudy (phi):
two minus signs "turn into" a plus sign so -18 – (-9) = becomes -18 + 9 the - -9 becomes +9 of course -18 + 9 = -9 you said -18 - +9 = -9 right which is confusing... that second - sign should not be there. It should only be -18 + 9 which does equal -9
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