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x in (-oo:+oo)
V = 15*(1/3)*x^13 // - 15*(1/3)*x^13
V-(15*(1/3)*x^13) = 0
V-5*x^13 = 0
-5*x^13 = -V // : -5
x^13 = V/5
x^13 = V/5 // ^ 1/13
x = (V^(1/13))/(5^(1/13))
x = (V^(1/13))/(5^(1/13))
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