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D( y )
2*y-6 = 0
2*y-6 = 0
2*y-6 = 0
2*y-6 = 0 // + 6
2*y = 6 // : 2
y = 6/2
y = 3
y in (-oo:3) U (3:+oo)
(3*y-9)/(2*y-6) = 0
3*y-9 = 0 // + 9
3*y = 9 // : 3
y = 9/3
y = 3
y in { 3}
y belongs to the empty set
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