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x in (-oo:+oo)
40-((4*x^16)/2) = 0
40-2*x^16 = 0
-2*x^16 = -40 // : -2
x^16 = 20
x^16 = 20 // ^ 1/16
abs(x) = 20^(1/16)
x = 20^(1/16) or x = -20^(1/16)
x in { 20^(1/16), -20^(1/16) }
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