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(15/11)*((4*x^3)/14)-((((2*x^1)/5)^5)/3) = 0
(15/11)*((4*x^3)/14)-((((2*x)/5)^5)/3) = 0
30/77*x^3-32/9375*x^5 = 0
2*x^3*(15/77-16/9375*x^2) = 0
-16/9375*x^2 = -15/77 // : -16/9375
x^2 = 140625/1232
x^2 = 140625/1232 // ^ 1/2
abs(x) = (140625/1232)^(1/2)
x = (140625/1232)^(1/2) or x = -(140625/1232)^(1/2)
2*x^3 = 0
2*x^3 = 0 // : 2
x^3 = 0
x = 0
x in { (140625/1232)^(1/2), -(140625/1232)^(1/2), 0 }
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