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-18+17m=19m+20
We move all terms to the left:
-18+17m-(19m+20)=0
We get rid of parentheses
17m-19m-20-18=0
We add all the numbers together, and all the variables
-2m-38=0
We move all terms containing m to the left, all other terms to the right
-2m=38
m=38/-2
m=-19
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