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D( x )
4*x-8 = 0
4*x-8 = 0
4*x-8 = 0
4*x-8 = 0 // + 8
4*x = 8 // : 4
x = 8/4
x = 2
x in (-oo:2) U (2:+oo)
(((3*x-6)/5)/(4*x-8))/25 = 0
(3*x-6)/(5*25*(4*x-8)) = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x in { 2}
x belongs to the empty set
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