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50m=50-80+80m
We move all terms to the left:
50m-(50-80+80m)=0
We add all the numbers together, and all the variables
50m-(80m-30)=0
We get rid of parentheses
50m-80m+30=0
We add all the numbers together, and all the variables
-30m+30=0
We move all terms containing m to the left, all other terms to the right
-30m=-30
m=-30/-30
m=1
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