-13m+7m=-72

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Solution for -13m+7m=-72 equation: 



-13m+7m=-72

We move all terms to the left:

-13m+7m-(-72)=0

We add all the numbers together, and all the variables

-6m+72=0

We move all terms containing m to the left, all other terms to the right

-6m=-72

m=-72/-6

m=+12

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