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2=13-m
We move all terms to the left:
2-(13-m)=0
We add all the numbers together, and all the variables
-(-1m+13)+2=0
We get rid of parentheses
1m-13+2=0
We add all the numbers together, and all the variables
m-11=0
We move all terms containing m to the left, all other terms to the right
m=11
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