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-7=13+2m
We move all terms to the left:
-7-(13+2m)=0
We add all the numbers together, and all the variables
-(2m+13)-7=0
We get rid of parentheses
-2m-13-7=0
We add all the numbers together, and all the variables
-2m-20=0
We move all terms containing m to the left, all other terms to the right
-2m=20
m=20/-2
m=-10
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