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