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D( w )
4*w+3 = 0
4*w+3 = 0
4*w+3 = 0
4*w+3 = 0 // - 3
4*w = -3 // : 4
w = -3/4
w in (-oo:-3/4) U (-3/4:+oo)
(13*w^2+26*w+28^3+25)/(4*w+3) = 0
(13*w^2+26*w+21977)/(4*w+3) = 0
13*w^2+26*w+21977 = 0
13*w^2+26*w+21977 = 0
DELTA = 26^2-(4*13*21977)
DELTA = -1142128
DELTA < 0
1 = 0
1/(4*w+3) = 0
w belongs to the empty set
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