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D( y )
3*y-12 = 0
3*y-12 = 0
3*y-12 = 0
3*y-12 = 0 // + 12
3*y = 12 // : 3
y = 12/3
y = 4
y in (-oo:4) U (4:+oo)
(2*y-8)/(3*y-12) = 0
2*y-8 = 0 // + 8
2*y = 8 // : 2
y = 8/2
y = 4
y in { 4}
y belongs to the empty set
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