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3(1=7x)=7x-39
We move all terms to the left:
3(1-(7x))=0
We add all the numbers together, and all the variables
3(-7x+1)=0
We multiply parentheses
-21x+3=0
We move all terms containing x to the left, all other terms to the right
-21x=-3
x=-3/-21
x=1/7
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