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13=3m+5-1
We move all terms to the left:
13-(3m+5-1)=0
We add all the numbers together, and all the variables
-(3m+4)+13=0
We get rid of parentheses
-3m-4+13=0
We add all the numbers together, and all the variables
-3m+9=0
We move all terms containing m to the left, all other terms to the right
-3m=-9
m=-9/-3
m=+3
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