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20m+20=-20+18m+4m
We move all terms to the left:
20m+20-(-20+18m+4m)=0
We add all the numbers together, and all the variables
20m-(22m-20)+20=0
We get rid of parentheses
20m-22m+20+20=0
We add all the numbers together, and all the variables
-2m+40=0
We move all terms containing m to the left, all other terms to the right
-2m=-40
m=-40/-2
m=+20
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