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w in (-oo:+oo)
(w^4)/5-11 = 0
1/5*w^4 = 11 // : 1/5
w^4 = 55
w^4 = 55 // ^ 1/4
abs(w) = 55^(1/4)
w = 55^(1/4) or w = -55^(1/4)
w in { 55^(1/4), -55^(1/4) }
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