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Emile Kessler

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4y ago

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More answers

M+(-9)=12

M+(-9)-(-9)=12-(-9) addition property of equality

M=12+9 rules for negative addition

M=21 addition and substitution

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Wiki User

14y ago
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m = -21

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Wiki User

14y ago
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Q: M plus 9 equals -12
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