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D( x )
8*x-24 = 0
8*x-24 = 0
8*x-24 = 0
8*x-24 = 0 // + 24
8*x = 24 // : 8
x = 24/8
x = 3
x in (-oo:3) U (3:+oo)
(3-x)/(8*x-24) = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x in { 3}
x belongs to the empty set
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