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D( w )
w^2-(10*w)+9 = 0
w-1 = 0
w^2-(10*w)+9 = 0
w^2-(10*w)+9 = 0
w^2-10*w+9 = 0
w^2-10*w+9 = 0
DELTA = (-10)^2-(1*4*9)
DELTA = 64
DELTA > 0
w = (64^(1/2)+10)/(1*2) or w = (10-64^(1/2))/(1*2)
w = 9 or w = 1
w-1 = 0
w-1 = 0
w-1 = 0 // + 1
w = 1
w in (-oo:1) U (1:9) U (9:+oo)
40/(w^2-(10*w)+9) = -((2*w)/(w-1)) // + (2*w)/(w-1)
40/(w^2-(10*w)+9)+(2*w)/(w-1) = 0
40/(w^2-10*w+9)+(2*w)/(w-1) = 0
w^2-10*w+9 = 0
w^2-10*w+9 = 0
w^2-10*w+9 = 0
DELTA = (-10)^2-(1*4*9)
DELTA = 64
DELTA > 0
w = (64^(1/2)+10)/(1*2) or w = (10-64^(1/2))/(1*2)
w = 9 or w = 1
(w-1)*(w-9) = 0
40/((w-1)*(w-9))+(2*w)/(w-1) = 0
40/((w-1)*(w-9))+(2*w*(w-9))/((w-1)*(w-9)) = 0
2*w*(w-9)+40 = 0
2*w^2-18*w+40 = 0
2*w^2-18*w+40 = 0
2*(w^2-9*w+20) = 0
w^2-9*w+20 = 0
DELTA = (-9)^2-(1*4*20)
DELTA = 1
DELTA > 0
w = (1^(1/2)+9)/(1*2) or w = (9-1^(1/2))/(1*2)
w = 5 or w = 4
2*(w-4)*(w-5) = 0
(2*(w-4)*(w-5))/((w-1)*(w-9)) = 0
(2*(w-4)*(w-5))/((w-1)*(w-9)) = 0 // * (w-1)*(w-9)
2*(w-4)*(w-5) = 0
( w-4 )
w-4 = 0 // + 4
w = 4
( w-5 )
w-5 = 0 // + 5
w = 5
w in { 4, 5 }
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