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