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28+27m=42+20m
We move all terms to the left:
28+27m-(42+20m)=0
We add all the numbers together, and all the variables
27m-(20m+42)+28=0
We get rid of parentheses
27m-20m-42+28=0
We add all the numbers together, and all the variables
7m-14=0
We move all terms containing m to the left, all other terms to the right
7m=14
m=14/7
m=2
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