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D( y )
y+3 = 0
y+6 = 0
y+3 = 0
y+3 = 0
y+3 = 0 // - 3
y = -3
y+6 = 0
y+6 = 0
y+6 = 0 // - 6
y = -6
y in (-oo:-6) U (-6:-3) U (-3:+oo)
(y-1)/(y+3)+1 = (y+4)/(y+6) // - (y+4)/(y+6)
(y-1)/(y+3)-((y+4)/(y+6))+1 = 0
(y-1)/(y+3)+(-1*(y+4))/(y+6)+1 = 0
((y-1)*(y+6))/((y+3)*(y+6))+(-1*(y+4)*(y+3))/((y+3)*(y+6))+(1*(y+3)*(y+6))/((y+3)*(y+6)) = 0
(y-1)*(y+6)-1*(y+4)*(y+3)+1*(y+3)*(y+6) = 0
y^2-2*y+9*y-18+18 = 0
y^2+7*y = 0
y^2+7*y = 0
y*(y+7) = 0
y+7 = 0 // - 7
y = -7
y*(y+7) = 0
(y*(y+7))/((y+3)*(y+6)) = 0
(y*(y+7))/((y+3)*(y+6)) = 0 // * (y+3)*(y+6)
y*(y+7) = 0
( y+7 )
y+7 = 0 // - 7
y = -7
( y )
y = 0
y in { -7, 0 }
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