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