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x in (-oo:+oo)
(3/5)*x^15 = x // - x
(3/5)*x^15-x = 0
3/5*x^15-x = 0
x*(3/5*x^14-1) = 0
3/5*x^14 = 1 // : 3/5
x^14 = 5/3
x^14 = 5/3 // ^ 1/14
abs(x) = (5/3)^(1/14)
x = (5/3)^(1/14) or x = -(5/3)^(1/14)
x = 0
x = 0
x in { (5/3)^(1/14), -(5/3)^(1/14), 0 }
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