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D( w )
w+6 = 0
w+5 = 0
w+6 = 0
w+6 = 0
w+6 = 0 // - 6
w = -6
w+5 = 0
w+5 = 0
w+5 = 0 // - 5
w = -5
w in (-oo:-6) U (-6:-5) U (-5:+oo)
(w+2)/(w+6) = (w-1)/(w+5)+1 // - (w-1)/(w+5)+1
(w+2)/(w+6)-((w-1)/(w+5))-1 = 0
(w+2)/(w+6)+(-1*(w-1))/(w+5)-1 = 0
((w+2)*(w+5))/((w+6)*(w+5))+(-1*(w-1)*(w+6))/((w+6)*(w+5))+(-1*(w+6)*(w+5))/((w+6)*(w+5)) = 0
(w+2)*(w+5)-1*(w-1)*(w+6)-1*(w+6)*(w+5) = 0
2*w-w^2-11*w-30+16 = 0
-w^2-9*w-14 = 0
-w^2-9*w-14 = 0
-1*(w^2+9*w+14) = 0
w^2+9*w+14 = 0
DELTA = 9^2-(1*4*14)
DELTA = 25
DELTA > 0
w = (25^(1/2)-9)/(1*2) or w = (-25^(1/2)-9)/(1*2)
w = -2 or w = -7
-1*(w+7)*(w+2) = 0
(-1*(w+7)*(w+2))/((w+6)*(w+5)) = 0
(-1*(w+7)*(w+2))/((w+6)*(w+5)) = 0 // * (w+6)*(w+5)
-1*(w+7)*(w+2) = 0
( w+2 )
w+2 = 0 // - 2
w = -2
( w+7 )
w+7 = 0 // - 7
w = -7
w in { -2, -7 }
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