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w in (-oo:+oo)
6/14 = (w^4)/9 // - (w^4)/9
6/14-((w^4)/9) = 0
-1/9*w^4 = -3/7 // : -1/9
w^4 = 27/7
w^4 = 27/7 // ^ 1/4
abs(w) = (27/7)^(1/4)
w = (27/7)^(1/4) or w = -(27/7)^(1/4)
w in { (27/7)^(1/4), -(27/7)^(1/4) }
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