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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w/w-(((3*w)/3)*w)-5-4 = w-((3/3)*w^2)-(19*w)+20 // - w-((3/3)*w^2)-(19*w)+20
(3/3)*w^2-(((3*w)/3)*w)-w+19*w+w/w-20-5-4 = 0
(3/3)*w^2-w^2-w+19*w+w/w-20-5-4 = 0
18*w-28 = 0 // + 28
18*w = 28 // : 18
w = 28/18
w = 14/9
w = 14/9
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