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57=7m-39
We move all terms to the left:
57-(7m-39)=0
We get rid of parentheses
-7m+39+57=0
We add all the numbers together, and all the variables
-7m+96=0
We move all terms containing m to the left, all other terms to the right
-7m=-96
m=-96/-7
m=13+5/7
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