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-100=4(m-5)
We move all terms to the left:
-100-(4(m-5))=0
We calculate terms in parentheses: -(4(m-5)), so:We get rid of parentheses
4(m-5)
We multiply parentheses
4m-20
Back to the equation:
-(4m-20)
-4m+20-100=0
We add all the numbers together, and all the variables
-4m-80=0
We move all terms containing m to the left, all other terms to the right
-4m=80
m=80/-4
m=-20
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