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w in (-oo:+oo)
(w/2)*w-3 = w/4 // - w/4
(w/2)*w-(w/4)-3 = 0
1/2*w^2-1/4*w-3 = 0
DELTA = (-1/4)^2-(-3*1/2*4)
DELTA = 97/16
DELTA > 0
w = ((97/16)^(1/2)+1/4)/(1/2*2) or w = (1/4-(97/16)^(1/2))/(1/2*2)
w = (97/16)^(1/2)+1/4 or w = 1/4-(97/16)^(1/2)
w in { 1/4-(97/16)^(1/2), (97/16)^(1/2)+1/4 }
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