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13=5+m
We move all terms to the left:
13-(5+m)=0
We add all the numbers together, and all the variables
-(m+5)+13=0
We get rid of parentheses
-m-5+13=0
We add all the numbers together, and all the variables
-1m+8=0
We move all terms containing m to the left, all other terms to the right
-m=-8
m=-8/-1
m=+8
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