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(7x+3)=57
We move all terms to the left:
(7x+3)-(57)=0
We get rid of parentheses
7x+3-57=0
We add all the numbers together, and all the variables
7x-54=0
We move all terms containing x to the left, all other terms to the right
7x=54
x=54/7
x=7+5/7
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