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x in (-oo:+oo)
y = x*((2*x^2)/5)-3 // - x*((2*x^2)/5)-3
y-(x*((2*x^2)/5))+3 = 0
(-2/5)*x^3+y+3 = 0
-2/5*x^3 = -(y+3) // : -2/5
x^3 = 5/2*(y+3)
x^3 = 5/2*(y+3) // ^ 1/3
x = (5/2)^(1/3)*(y+3)^(1/3)
x = (5/2)^(1/3)*(y+3)^(1/3)
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