If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
y = (-1/3)*x^3 // - (-1/3)*x^3
y-((-1/3)*x^3) = 0
(1/3)*x^3+y = 0
1/3*x^3 = -y // : 1/3
x^3 = -3*y
x^3 = -3*y // ^ 1/3
x = -3^(1/3)*y^(1/3)
x = -3^(1/3)*y^(1/3)
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