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7=8m-12
We move all terms to the left:
7-(8m-12)=0
We get rid of parentheses
-8m+12+7=0
We add all the numbers together, and all the variables
-8m+19=0
We move all terms containing m to the left, all other terms to the right
-8m=-19
m=-19/-8
m=2+3/8
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