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D( y )
4*y-24 = 0
4*y-24 = 0
4*y-24 = 0
4*y-24 = 0 // + 24
4*y = 24 // : 4
y = 24/4
y = 6
y in (-oo:6) U (6:+oo)
(5*y-30)/(4*y-24) = 0
5*y-30 = 0 // + 30
5*y = 30 // : 5
y = 30/5
y = 6
y in { 6}
y belongs to the empty set
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