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D( x )
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0
2*x-4 = 0 // + 4
2*x = 4 // : 2
x = 4/2
x = 2
x in (-oo:2) U (2:+oo)
(8-x^3)/(2*x-4) = 0
-1*x^3 = -8 // : -1
x^3 = 8
x^3 = 8 // ^ 1/3
x = 2
x in { 2}
x belongs to the empty set
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