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m/7+39=42
We move all terms to the left:
m/7+39-(42)=0
We add all the numbers together, and all the variables
m/7-3=0
We multiply all the terms by the denominator
m-3*7=0
We add all the numbers together, and all the variables
m-21=0
We move all terms containing m to the left, all other terms to the right
m=21
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