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D( d )
3*d-9 = 0
d-4 = 0
2*d-4 = 0
3*d-9 = 0
3*d-9 = 0
3*d-9 = 0 // + 9
3*d = 9 // : 3
d = 9/3
d = 3
d-4 = 0
d-4 = 0
d-4 = 0 // + 4
d = 4
2*d-4 = 0
2*d-4 = 0
2*d-4 = 0 // + 4
2*d = 4 // : 2
d = 4/2
d = 2
d in (-oo:2) U (2:3) U (3:4) U (4:+oo)
(((4*((d-2)/(3*d-9)))/(d-4))*(2*d-6))/(2*d-4) = 0
(4*(d-2)*(2*d-6))/((3*d-9)*(d-4)*(2*d-4)) = 0
( 2*d-6 )
2*d-6 = 0 // + 6
2*d = 6 // : 2
d = 6/2
d = 3
( 4 )
4 = 0
d belongs to the empty set
( d-2 )
d-2 = 0 // + 2
d = 2
d in { 3}
d in { 2}
d belongs to the empty set
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