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x in (-oo:+oo)
5*x-(((3*x^2)/2)*x^4) = 0
(-3/2)*x^6+5*x = 0
5*x-3/2*x^6 = 0
x*(5-3/2*x^5) = 0
-3/2*x^5 = -5 // : -3/2
x^5 = 10/3
x^5 = 10/3 // ^ 1/5
x = (10/3)^(1/5)
x = 0
x = 0
x in { (10/3)^(1/5), 0 }
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