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D( x )
4*x-12 = 0
5/(4*x-12) = 0
2*x-6 = 0
4*x-12 = 0
4*x-12 = 0
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
5/(4*x-12) = 0
5/(4*x-12) = 0
5 = 0
x belongs to the empty set
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x in (-oo:3) U (3:+oo)
(3/(2*x-6))/(5/(4*x-12)) = 0
(3*(4*x-12))/(5*(2*x-6)) = 0
( 3 )
3 = 0
x belongs to the empty set
( 4*x-12 )
4*x-12 = 0 // + 12
4*x = 12 // : 4
x = 12/4
x = 3
x in { 3}
x belongs to the empty set
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