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D( y )
y+4 = 0
y+5 = 0
y+4 = 0
y+4 = 0
y+4 = 0 // - 4
y = -4
y+5 = 0
y+5 = 0
y+5 = 0 // - 5
y = -5
y in (-oo:-5) U (-5:-4) U (-4:+oo)
(y+6)/(y+4) = (y+7)/(y+5)+1 // - (y+7)/(y+5)+1
(y+6)/(y+4)-((y+7)/(y+5))-1 = 0
(y+6)/(y+4)+(-1*(y+7))/(y+5)-1 = 0
((y+6)*(y+5))/((y+4)*(y+5))+(-1*(y+7)*(y+4))/((y+4)*(y+5))+(-1*(y+4)*(y+5))/((y+4)*(y+5)) = 0
(y+6)*(y+5)-1*(y+7)*(y+4)-1*(y+4)*(y+5) = 0
2-y^2-9*y-20 = 0
-y^2-9*y-18 = 0
-y^2-9*y-18 = 0
-1*(y^2+9*y+18) = 0
y^2+9*y+18 = 0
DELTA = 9^2-(1*4*18)
DELTA = 9
DELTA > 0
y = (9^(1/2)-9)/(1*2) or y = (-9^(1/2)-9)/(1*2)
y = -3 or y = -6
-1*(y+6)*(y+3) = 0
(-1*(y+6)*(y+3))/((y+4)*(y+5)) = 0
(-1*(y+6)*(y+3))/((y+4)*(y+5)) = 0 // * (y+4)*(y+5)
-1*(y+6)*(y+3) = 0
( y+3 )
y+3 = 0 // - 3
y = -3
( y+6 )
y+6 = 0 // - 6
y = -6
y in { -3, -6 }
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