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-20-11m=-7m+20
We move all terms to the left:
-20-11m-(-7m+20)=0
We get rid of parentheses
-11m+7m-20-20=0
We add all the numbers together, and all the variables
-4m-40=0
We move all terms containing m to the left, all other terms to the right
-4m=40
m=40/-4
m=-10
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