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(2x+3=7)
We move all terms to the left:
(2x+3-(7))=0
We add all the numbers together, and all the variables
(2x-4)=0
We get rid of parentheses
2x-4=0
We move all terms containing x to the left, all other terms to the right
2x=4
x=4/2
x=2
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