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w in (-oo:+oo)
((7*w)/2)*w-10 = 0
7/2*w^2 = 10 // : 7/2
w^2 = 20/7
w^2 = 20/7 // ^ 1/2
abs(w) = (20/7)^(1/2)
w = (20/7)^(1/2) or w = -(20/7)^(1/2)
w in { (20/7)^(1/2), -(20/7)^(1/2) }
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