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