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x in (-oo:+oo)
40-((4*x^16)/2) = 8 // - 8
40-((4*x^16)/2)-8 = 0
40-2*x^16-8 = 0
-2*x^16 = -32 // : -2
x^16 = 16
x^16 = 16 // ^ 1/16
abs(x) = 16^(1/16)
x = 16^(1/16) or x = -16^(1/16)
x in { 16^(1/16), -16^(1/16) }
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