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D( y )
y = 0
y+2 = 0
y = 0
y = 0
y+2 = 0
y+2 = 0
y+2 = 0 // - 2
y = -2
y in (-oo:-2) U (-2:0) U (0:+oo)
(y-1)/(y+2)+2/y-1 = 0
(y*(y-1))/(y*(y+2))+(2*(y+2))/(y*(y+2))+(-1*y*(y+2))/(y*(y+2)) = 0
y*(y-1)+2*(y+2)-1*y*(y+2) = 0
y^2-y^2+y-2*y+4 = 0
4-y = 0
(4-y)/(y*(y+2)) = 0
(4-y)/(y*(y+2)) = 0 // * y*(y+2)
4-y = 0
4-y = 0 // - 4
-y = -4 // * -1
y = 4
y = 4
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