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90=10(-4+m)
We move all terms to the left:
90-(10(-4+m))=0
We add all the numbers together, and all the variables
-(10(m-4))+90=0
We calculate terms in parentheses: -(10(m-4)), so:We get rid of parentheses
10(m-4)
We multiply parentheses
10m-40
Back to the equation:
-(10m-40)
-10m+40+90=0
We add all the numbers together, and all the variables
-10m+130=0
We move all terms containing m to the left, all other terms to the right
-10m=-130
m=-130/-10
m=+13
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