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x in (-oo:+oo)
a = ((8/15)*x^15)/1 // - ((8/15)*x^15)/1
a-(((8/15)*x^15)/1) = 0
a+(-8/15)*x^15 = 0
-8/15*x^15 = -a // : -8/15
x^15 = 15/8*a
x^15 = 15/8*a // ^ 1/15
x = (15/8)^(1/15)*a^(1/15)
x = (15/8)^(1/15)*a^(1/15)
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