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x*x*x-2x-4=0.2
We move all terms to the left:
x*x*x-2x-4-(0.2)=0
We add all the numbers together, and all the variables
-2x+x*x*x-4.2=0
Wy multiply elements
x^3*x-2x-4.2=0
We do not support expression: x^3
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