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D( w )
w+1 = 0
w+7 = 0
w+1 = 0
w+1 = 0
w+1 = 0 // - 1
w = -1
w+7 = 0
w+7 = 0
w+7 = 0 // - 7
w = -7
w in (-oo:-7) U (-7:-1) U (-1:+oo)
(w-1)/(w+1) = (w+6)/(w+7)+1 // - (w+6)/(w+7)+1
(w-1)/(w+1)-((w+6)/(w+7))-1 = 0
(w-1)/(w+1)+(-1*(w+6))/(w+7)-1 = 0
((w-1)*(w+7))/((w+1)*(w+7))+(-1*(w+6)*(w+1))/((w+1)*(w+7))+(-1*(w+1)*(w+7))/((w+1)*(w+7)) = 0
(w-1)*(w+7)-1*(w+6)*(w+1)-1*(w+1)*(w+7) = 0
-w^2-w-8*w-13-7 = 0
-w^2-9*w-20 = 0
-w^2-9*w-20 = 0
-1*(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 = (-1^(1/2)-9)/(1*2)
w = -4 or w = -5
-1*(w+5)*(w+4) = 0
(-1*(w+5)*(w+4))/((w+1)*(w+7)) = 0
(-1*(w+5)*(w+4))/((w+1)*(w+7)) = 0 // * (w+1)*(w+7)
-1*(w+5)*(w+4) = 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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