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D( w )
w-1 = 0
w+2 = 0
w-1 = 0
w-1 = 0
w-1 = 0 // + 1
w = 1
w+2 = 0
w+2 = 0
w+2 = 0 // - 2
w = -2
w in (-oo:-2) U (-2:1) U (1:+oo)
-4/(w-1) = 6-(5/(w+2)) // - 6-(5/(w+2))
5/(w+2)-4/(w-1)-6 = 0
(-4*(w+2))/((w-1)*(w+2))+(5*(w-1))/((w-1)*(w+2))+(-6*(w-1)*(w+2))/((w-1)*(w+2)) = 0
5*(w-1)-4*(w+2)-6*(w-1)*(w+2) = 0
w-6*w^2-6*w-13+12 = 0
-6*w^2-5*w-1 = 0
-6*w^2-5*w-1 = 0
-1*(6*w^2+5*w+1) = 0
6*w^2+5*w+1 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
w = (1^(1/2)-5)/(2*6) or w = (-1^(1/2)-5)/(2*6)
w = -1/3 or w = -1/2
-1*(w+1/2)*(w+1/3) = 0
(-1*(w+1/2)*(w+1/3))/((w-1)*(w+2)) = 0
(-1*(w+1/2)*(w+1/3))/((w-1)*(w+2)) = 0 // * (w-1)*(w+2)
-1*(w+1/2)*(w+1/3) = 0
( w+1/2 )
w+1/2 = 0 // - 1/2
w = -1/2
( w+1/3 )
w+1/3 = 0 // - 1/3
w = -1/3
w in { -1/2, -1/3 }
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