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D( y )
y+4 = 0
y+5 = 0
y-2 = 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-2 = 0
y-2 = 0
y-2 = 0 // + 2
y = 2
y in (-oo:-5) U (-5:-4) U (-4:2) U (2:+oo)
2/(y+4)+4/(y-2) = 6/(y+5) // - 6/(y+5)
2/(y+4)+4/(y-2)-(6/(y+5)) = 0
2/(y+4)+4/(y-2)-6*(y+5)^-1 = 0
2/(y+4)+4/(y-2)-6/(y+5) = 0
(2*(y-2)*(y+5))/((y+4)*(y-2)*(y+5))+(4*(y+4)*(y+5))/((y+4)*(y-2)*(y+5))+(-6*(y+4)*(y-2))/((y+4)*(y-2)*(y+5)) = 0
2*(y-2)*(y+5)+4*(y+4)*(y+5)-6*(y+4)*(y-2) = 0
6*y^2-6*y^2+42*y-12*y+48+60 = 0
30*y+108 = 0
(30*y+108)/((y+4)*(y-2)*(y+5)) = 0
(30*y+108)/((y+4)*(y-2)*(y+5)) = 0 // * (y+4)*(y-2)*(y+5)
30*y+108 = 0
30*y+108 = 0 // - 108
30*y = -108 // : 30
y = -108/30
y = -18/5
y = -18/5
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