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(2x+3)(2x+3)(2x-3)=3
We move all terms to the left:
(2x+3)(2x+3)(2x-3)-(3)=0
We multiply parentheses ..
(+4x^2+6x+6x+9)(2x-3)-3=0
We move all terms containing x to the left, all other terms to the right
(+4x^2+6x+6x+9)(2x-3)=3
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