7m-8m=12

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Solution for 7m-8m=12 equation: 



7m-8m=12

We move all terms to the left:

7m-8m-(12)=0

We add all the numbers together, and all the variables

-1m-12=0

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

-m=12

m=12/-1

m=-12

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