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(x3)^3=(x3)^3*2-8
We move all terms to the left:
(x3)^3-((x3)^3*2-8)=0
We get rid of parentheses
x3^3-x3^3*2+8=0
Wy multiply elements
-2x^3+x3^3+8=0
We do not support expression: x^3
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