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x in (-oo:+oo)
((x^3)/2+(y^3)/2)*((x^3)/2-((y^3)/2)) = 0
(1/2*x^3+1/2*y^3)*(1/2*x^3-1/2*y^3) = 0
( 1/2*x^3+1/2*y^3 )
1/2*x^3 = -(1/2*y^3) // : 1/2
x^3 = -y^3
x^3 = -y^3 // ^ 1/3
x = y
( 1/2*x^3-1/2*y^3 )
1/2*x^3 = -(-1/2*y^3) // : 1/2
x^3 = y^3
x^3 = y^3 // ^ 1/3
x = y
x in { y, y }
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