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x in (-oo:+oo)
(7/10)*x^6 = 40 // - 40
(7/10)*x^6-40 = 0
7/10*x^6 = 40 // : 7/10
x^6 = 400/7
x^6 = 400/7 // ^ 1/6
abs(x) = (400/7)^(1/6)
x = (400/7)^(1/6) or x = -(400/7)^(1/6)
x in { (400/7)^(1/6), -(400/7)^(1/6) }
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