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(2x+3)^2+8(2x+3)+11=0
We multiply parentheses
(2x+3)^2+16x+24+11=0
We add all the numbers together, and all the variables
16x+(2x+3)^2+35=0
We move all terms containing x to the left, all other terms to the right
16x+(2x+3)^2=-35
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