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