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-8(m+84)=40
We move all terms to the left:
-8(m+84)-(40)=0
We multiply parentheses
-8m-672-40=0
We add all the numbers together, and all the variables
-8m-712=0
We move all terms containing m to the left, all other terms to the right
-8m=712
m=712/-8
m=-89
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