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x in (-oo:+oo)
a = ((5/7)*x^14)/15 // - ((5/7)*x^14)/15
a-(((5/7)*x^14)/15) = 0
a+(-1/21)*x^14 = 0
-1/21*x^14 = -a // : -1/21
x^14 = 21*a
x^14 = 21*a // ^ 1/14
abs(x) = 21^(1/14)*a^(1/14)
x = 21^(1/14)*a^(1/14) or x = -(21^(1/14)*a^(1/14))
x in { 21^(1/14)*a^(1/14), -(21^(1/14)*a^(1/14)) }
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