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13=-6+m
We move all terms to the left:
13-(-6+m)=0
We add all the numbers together, and all the variables
-(m-6)+13=0
We get rid of parentheses
-m+6+13=0
We add all the numbers together, and all the variables
-1m+19=0
We move all terms containing m to the left, all other terms to the right
-m=-19
m=-19/-1
m=+19
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