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13+m=3+3m
We move all terms to the left:
13+m-(3+3m)=0
We add all the numbers together, and all the variables
m-(3m+3)+13=0
We get rid of parentheses
m-3m-3+13=0
We add all the numbers together, and all the variables
-2m+10=0
We move all terms containing m to the left, all other terms to the right
-2m=-10
m=-10/-2
m=+5
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