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D( w )
w^2 = 0
w^2 = 0
w^2 = 0
1*w^2 = 0 // : 1
w^2 = 0
w = 0
w in (-oo:0) U (0:+oo)
(2*w^2)/(w^2)-(((10*w)/(-12))*w)-(28/35) = 0
(5/6)*w^2+(2*w^2)/(w^2)-4/5 = 0
5/6*w^2 = -6/5 // : 5/6
w^2 = -36/25
w belongs to the empty set
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