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71.2=8(m+2.1)
We move all terms to the left:
71.2-(8(m+2.1))=0
We calculate terms in parentheses: -(8(m+2.1)), so:We get rid of parentheses
8(m+2.1)
We multiply parentheses
8m+16.8
Back to the equation:
-(8m+16.8)
-8m-16.8+71.2=0
We add all the numbers together, and all the variables
-8m+54.4=0
We move all terms containing m to the left, all other terms to the right
-8m=-54.4
m=-54.4/-8
m=6+2.6666666666667/3.3333333333333
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