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D( y )
y-4 = 0
y-4 = 0
y-4 = 0
y-4 = 0 // + 4
y = 4
y in (-oo:4) U (4:+oo)
(9*y-8)/(y-4) = 0
9*y-8 = 0 // + 8
9*y = 8 // : 9
y = 8/9
y = 8/9
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