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D( y )
8*y-9 = 0
8*y-9 = 0
8*y-9 = 0
8*y-9 = 0 // + 9
8*y = 9 // : 8
y = 9/8
y in (-oo:9/8) U (9/8:+oo)
(3*y-6)/(8*y-9) = 0
3*y-6 = 0 // + 6
3*y = 6 // : 3
y = 6/3
y = 2
y = 2
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