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7(3x-1)=55
We move all terms to the left:
7(3x-1)-(55)=0
We multiply parentheses
21x-7-55=0
We add all the numbers together, and all the variables
21x-62=0
We move all terms containing x to the left, all other terms to the right
21x=62
x=62/21
x=2+20/21
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