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D( y )
y-2 = 0
y-2 = 0
y-2 = 0
y-2 = 0 // + 2
y = 2
y in (-oo:2) U (2:+oo)
(4*y+1)/(y-2)-((y-2)/(y-2)) = 0
(4*y+1)/(y-2)-1 = 0
(4*y+1)/(y-2)+(-1*(y-2))/(y-2) = 0
4*y-1*(y-2)+1 = 0
3*y+3 = 0
(3*y+3)/(y-2) = 0
(3*y+3)/(y-2) = 0 // * y-2
3*y+3 = 0
3*y+3 = 0 // - 3
3*y = -3 // : 3
y = -3/3
y = -1
y = -1
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