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20m+100=30m+50
We move all terms to the left:
20m+100-(30m+50)=0
We get rid of parentheses
20m-30m-50+100=0
We add all the numbers together, and all the variables
-10m+50=0
We move all terms containing m to the left, all other terms to the right
-10m=-50
m=-50/-10
m=+5
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