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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)
(y-3)/(y+2) = 0
y-3 = 0 // + 3
y = 3
y = 3
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