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