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90=3(-5+5m)
We move all terms to the left:
90-(3(-5+5m))=0
We add all the numbers together, and all the variables
-(3(5m-5))+90=0
We calculate terms in parentheses: -(3(5m-5)), so:We get rid of parentheses
3(5m-5)
We multiply parentheses
15m-15
Back to the equation:
-(15m-15)
-15m+15+90=0
We add all the numbers together, and all the variables
-15m+105=0
We move all terms containing m to the left, all other terms to the right
-15m=-105
m=-105/-15
m=+7
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