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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) // - (y+7)/(y+5)
(y+6)/(y+4)-((y+7)/(y+5)) = 0
(y+6)/(y+4)+(-1*(y+7))/(y+5) = 0
((y+6)*(y+5))/((y+4)*(y+5))+(-1*(y+7)*(y+4))/((y+4)*(y+5)) = 0
(y+6)*(y+5)-1*(y+7)*(y+4) = 0
2 = 0
2/((y+4)*(y+5)) = 0
2/((y+4)*(y+5)) = 0 // * (y+4)*(y+5)
2 = 0
y belongs to the empty set
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