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(7x-3-3x=13)
We move all terms to the left:
(7x-3-3x-(13))=0
We add all the numbers together, and all the variables
(4x-16)=0
We get rid of parentheses
4x-16=0
We move all terms containing x to the left, all other terms to the right
4x=16
x=16/4
x=4
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