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81=9(m+2.1)
We move all terms to the left:
81-(9(m+2.1))=0
We calculate terms in parentheses: -(9(m+2.1)), so:We get rid of parentheses
9(m+2.1)
We multiply parentheses
9m+18.9
Back to the equation:
-(9m+18.9)
-9m-18.9+81=0
We add all the numbers together, and all the variables
-9m+62.1=0
We move all terms containing m to the left, all other terms to the right
-9m=-62.1
m=-62.1/-9
m=6+7.3636363636364/8.1818181818182
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