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-7(m+81)=7
We move all terms to the left:
-7(m+81)-(7)=0
We multiply parentheses
-7m-567-7=0
We add all the numbers together, and all the variables
-7m-574=0
We move all terms containing m to the left, all other terms to the right
-7m=574
m=574/-7
m=-82
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