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D( y )
y+2 = 0
2*y = 0
y+2 = 0
y+2 = 0
y+2 = 0 // - 2
y = -2
2*y = 0
2*y = 0
2*y = 0 // : 2
y = 0
y in (-oo:-2) U (-2:0) U (0:+oo)
3/(2*y) = 16/(y+2) // - 16/(y+2)
3/(2*y)-(16/(y+2)) = 0
3/(2*y)-16*(y+2)^-1 = 0
3/(2*y)-16/(y+2) = 0
(-16*2*y)/(2*y*(y+2))+(3*(y+2))/(2*y*(y+2)) = 0
3*(y+2)-16*2*y = 0
6-29*y = 0
(6-29*y)/(2*y*(y+2)) = 0
(6-29*y)/(2*y*(y+2)) = 0 // * 2*y*(y+2)
6-29*y = 0
6-29*y = 0 // - 6
-29*y = -6 // : -29
y = -6/(-29)
y = 6/29
y = 6/29
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