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(2n+3)^2=2n+12
We move all terms to the left:
(2n+3)^2-(2n+12)=0
We get rid of parentheses
(2n+3)^2-2n-12=0
We add all the numbers together, and all the variables
-2n+(2n+3)^2-12=0
We move all terms containing n to the left, all other terms to the right
-2n+(2n+3)^2=12
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