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x in (-oo:+oo)
6/18 = (1/3)*x^6 // - (1/3)*x^6
6/18-((1/3)*x^6) = 0
(-1/3)*x^6+6/18 = 0
-1/3*x^6 = -1/3 // : -1/3
x^6 = 1
x^6 = 1 // ^ 1/6
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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