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(x-2)^3+(3x-1)(3x+1)=(x+1)^3(-2)^3+(3x-1)(3x+1)=(x+1)^3
We move all terms to the left:
(x-2)^3+(3x-1)(3x+1)-((x+1)^3(-2)^3+(3x-1)(3x+1))=0
We use the square of the difference formula
9x^2+9x^2+(x-2)^3-1+1=0
We add all the numbers together, and all the variables
18x^2+(x-2)^3=0
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