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x in (-oo:+oo)
x^2*(243-(x*((x^2)/2))) = 0
x^2*((-1/2)*x^3+243) = 0
x^2*(243-1/2*x^3) = 0
( 243-1/2*x^3 )
-1/2*x^3 = -243 // : -1/2
x^3 = 486
x^3 = 486 // ^ 1/3
x = 3*18^(1/3)
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { 3*18^(1/3), 0 }
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