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