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-13=5-2m+20m
We move all terms to the left:
-13-(5-2m+20m)=0
We add all the numbers together, and all the variables
-(18m+5)-13=0
We get rid of parentheses
-18m-5-13=0
We add all the numbers together, and all the variables
-18m-18=0
We move all terms containing m to the left, all other terms to the right
-18m=18
m=18/-18
m=-1
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