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13=15-m
We move all terms to the left:
13-(15-m)=0
We add all the numbers together, and all the variables
-(-1m+15)+13=0
We get rid of parentheses
1m-15+13=0
We add all the numbers together, and all the variables
m-2=0
We move all terms containing m to the left, all other terms to the right
m=2
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