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10m+30=20m-50
We move all terms to the left:
10m+30-(20m-50)=0
We get rid of parentheses
10m-20m+50+30=0
We add all the numbers together, and all the variables
-10m+80=0
We move all terms containing m to the left, all other terms to the right
-10m=-80
m=-80/-10
m=+8
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