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(3x-12)+7=7
We move all terms to the left:
(3x-12)+7-(7)=0
We add all the numbers together, and all the variables
(3x-12)=0
We get rid of parentheses
3x-12=0
We move all terms containing x to the left, all other terms to the right
3x=12
x=12/3
x=4
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