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w in (-oo:+oo)
3/4 = (w^2)/5 // - (w^2)/5
3/4-((w^2)/5) = 0
-1/5*w^2 = -3/4 // : -1/5
w^2 = 15/4
w^2 = 15/4 // ^ 1/2
abs(w) = (15/4)^(1/2)
w = (15/4)^(1/2) or w = -(15/4)^(1/2)
w in { (15/4)^(1/2), -(15/4)^(1/2) }
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