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D( y )
y-7 = 0
y-6 = 0
y-7 = 0
y-7 = 0
y-7 = 0 // + 7
y = 7
y-6 = 0
y-6 = 0
y-6 = 0 // + 6
y = 6
y in (-oo:6) U (6:7) U (7:+oo)
(y-5)/(y-6)-1 = (y-3)/(y-7) // - (y-3)/(y-7)
(y-5)/(y-6)-((y-3)/(y-7))-1 = 0
(y-5)/(y-6)+(-1*(y-3))/(y-7)-1 = 0
((y-5)*(y-7))/((y-6)*(y-7))+(-1*(y-3)*(y-6))/((y-6)*(y-7))+(-1*(y-6)*(y-7))/((y-6)*(y-7)) = 0
(y-5)*(y-7)-1*(y-3)*(y-6)-1*(y-6)*(y-7) = 0
13*y-y^2-3*y-42+17 = 0
10*y-y^2-25 = 0
10*y-y^2-25 = 0
10*y-y^2-25 = 0
DELTA = 10^2-(-25*(-1)*4)
DELTA = 0
y = -10/(-1*2)
y = 5 or y = 5
(y-5)^2 = 0
((y-5)^2)/((y-6)*(y-7)) = 0
((y-5)^2)/((y-6)*(y-7)) = 0 // * (y-6)*(y-7)
(y-5)^2 = 0
y-5 = 0 // + 5
y = 5
y in { 5, 5 }
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