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