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D( w )
w-2 = 0
4*w-8 = 0
w-2 = 0
w-2 = 0
w-2 = 0 // + 2
w = 2
4*w-8 = 0
4*w-8 = 0
4*w-8 = 0 // + 8
4*w = 8 // : 4
w = 8/4
w = 2
w in (-oo:2) U (2:+oo)
7/(4*w-8)+1 = -(2/(w-2)) // + 2/(w-2)
7/(4*w-8)+2/(w-2)+1 = 0
(7*(w-2))/((4*w-8)*(w-2))+(2*(4*w-8))/((4*w-8)*(w-2))+(1*(4*w-8)*(w-2))/((4*w-8)*(w-2)) = 0
7*(w-2)+2*(4*w-8)+1*(4*w-8)*(w-2) = 0
4*w^2+15*w-16*w-30+16 = 0
4*w^2-w-14 = 0
4*w^2-w-14 = 0
4*w^2-w-14 = 0
DELTA = (-1)^2-(-14*4*4)
DELTA = 225
DELTA > 0
w = (225^(1/2)+1)/(2*4) or w = (1-225^(1/2))/(2*4)
w = 2 or w = -7/4
(w+7/4)*(w-2) = 0
((w+7/4)*(w-2))/((4*w-8)*(w-2)) = 0
((w+7/4)*(w-2))/((4*w-8)*(w-2)) = 0 // * (4*w-8)*(w-2)
(w+7/4)*(w-2) = 0
( w+7/4 )
w+7/4 = 0 // - 7/4
w = -7/4
( w-2 )
w-2 = 0 // + 2
w = 2
w in { 2}
w = -7/4
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