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7=4m-2m+13
We move all terms to the left:
7-(4m-2m+13)=0
We add all the numbers together, and all the variables
-(2m+13)+7=0
We get rid of parentheses
-2m-13+7=0
We add all the numbers together, and all the variables
-2m-6=0
We move all terms containing m to the left, all other terms to the right
-2m=6
m=6/-2
m=-3
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