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-18m=18m+20
We move all terms to the left:
-18m-(18m+20)=0
We get rid of parentheses
-18m-18m-20=0
We add all the numbers together, and all the variables
-36m-20=0
We move all terms containing m to the left, all other terms to the right
-36m=20
m=20/-36
m=-5/9
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