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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)
(2*y-6)/(y-2) = 0
2*y-6 = 0 // + 6
2*y = 6 // : 2
y = 6/2
y = 3
y = 3
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