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D( y )
2*y-16 = 0
2*y-16 = 0
2*y-16 = 0
2*y-16 = 0 // + 16
2*y = 16 // : 2
y = 16/2
y = 8
y in (-oo:8) U (8:+oo)
(3*y-24)/(2*y-16) = 0
3*y-24 = 0 // + 24
3*y = 24 // : 3
y = 24/3
y = 8
y in { 8}
y belongs to the empty set
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