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-13=3+20m
We move all terms to the left:
-13-(3+20m)=0
We add all the numbers together, and all the variables
-(20m+3)-13=0
We get rid of parentheses
-20m-3-13=0
We add all the numbers together, and all the variables
-20m-16=0
We move all terms containing m to the left, all other terms to the right
-20m=16
m=16/-20
m=-4/5
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