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108=-12m-4(-5m+7)
We move all terms to the left:
108-(-12m-4(-5m+7))=0
We calculate terms in parentheses: -(-12m-4(-5m+7)), so:We get rid of parentheses
-12m-4(-5m+7)
We multiply parentheses
-12m+20m-28
We add all the numbers together, and all the variables
8m-28
Back to the equation:
-(8m-28)
-8m+28+108=0
We add all the numbers together, and all the variables
-8m+136=0
We move all terms containing m to the left, all other terms to the right
-8m=-136
m=-136/-8
m=+17
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