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D( y )
8*y-16 = 0
8*y-16 = 0
8*y-16 = 0
8*y-16 = 0 // + 16
8*y = 16 // : 8
y = 16/8
y = 2
y in (-oo:2) U (2:+oo)
(7*y-14)/(8*y-16) = 0
7*y-14 = 0 // + 14
7*y = 14 // : 7
y = 14/7
y = 2
y in { 2}
y belongs to the empty set
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