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-6.3m-9.35=-3.9m+7.21
We move all terms to the left:
-6.3m-9.35-(-3.9m+7.21)=0
We get rid of parentheses
-6.3m+3.9m-7.21-9.35=0
We add all the numbers together, and all the variables
-2.4m-16.56=0
We move all terms containing m to the left, all other terms to the right
-2.4m=16.56
m=16.56/-2.4
m=-6+1/1.1111111111111
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