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D( w )
w+5 = 0
w+7 = 0
w+5 = 0
w+5 = 0
w+5 = 0 // - 5
w = -5
w+7 = 0
w+7 = 0
w+7 = 0 // - 7
w = -7
w in (-oo:-7) U (-7:-5) U (-5:+oo)
(w+1)/(w+5) = (w-5)/(w+7)+1 // - (w-5)/(w+7)+1
(w+1)/(w+5)-((w-5)/(w+7))-1 = 0
(w+1)/(w+5)+(-1*(w-5))/(w+7)-1 = 0
((w+1)*(w+7))/((w+5)*(w+7))+(-1*(w-5)*(w+5))/((w+5)*(w+7))+(-1*(w+5)*(w+7))/((w+5)*(w+7)) = 0
(w+1)*(w+7)-1*(w-5)*(w+5)-1*(w+5)*(w+7) = 0
8*w-w^2-12*w-35+32 = 0
-w^2-4*w-3 = 0
-w^2-4*w-3 = 0
-1*(w^2+4*w+3) = 0
w^2+4*w+3 = 0
DELTA = 4^2-(1*3*4)
DELTA = 4
DELTA > 0
w = (4^(1/2)-4)/(1*2) or w = (-4^(1/2)-4)/(1*2)
w = -1 or w = -3
-1*(w+3)*(w+1) = 0
(-1*(w+3)*(w+1))/((w+5)*(w+7)) = 0
(-1*(w+3)*(w+1))/((w+5)*(w+7)) = 0 // * (w+5)*(w+7)
-1*(w+3)*(w+1) = 0
( w+1 )
w+1 = 0 // - 1
w = -1
( w+3 )
w+3 = 0 // - 3
w = -3
w in { -1, -3 }
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