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w in (-oo:+oo)
(1-((3*w)/2))^2 = 0
((-3/2)*w+1)^2 = 0
(1-3/2*w)^2 = 0
1-3/2*w = 0 // - 1
-3/2*w = -1 // : -3/2
w = -1/(-3/2)
w = 2/3
w in { 2/3, 2/3 }
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