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13=-1-m
We move all terms to the left:
13-(-1-m)=0
We add all the numbers together, and all the variables
-(-1m-1)+13=0
We get rid of parentheses
1m+1+13=0
We add all the numbers together, and all the variables
m+14=0
We move all terms containing m to the left, all other terms to the right
m=-14
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