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51=m/3+42
We move all terms to the left:
51-(m/3+42)=0
We get rid of parentheses
-m/3-42+51=0
We multiply all the terms by the denominator
-m-42*3+51*3=0
We add all the numbers together, and all the variables
-1m+27=0
We move all terms containing m to the left, all other terms to the right
-m=-27
m=-27/-1
m=+27
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