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3*(((3*y)/3)*y^2-(3*x)) = 0
3*(((3*y)/3)*y^2-3*x) = 0
3*(y^3-3*x) = 0
( 3 )
3 = 0
x belongs to the empty set
( y^3-3*x )
y^3-3*x = 0 // - y^3
-3*x = -y^3 // : -3
x = (-y^3)/(-3)
x = (y^3)/3
x = (y^3)/3
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