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x in (-oo:+oo)
((14/9)*x^6)/7-(4/9) = 0
((14/9)*x^6)/7-4/9 = 0
2/9*x^6 = 4/9 // : 2/9
x^6 = 2
x^6 = 2 // ^ 1/6
abs(x) = 2^(1/6)
x = 2^(1/6) or x = -2^(1/6)
x in { 2^(1/6), -2^(1/6) }
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