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D( x )
4-(2*x) = 0
4-(2*x) = 0
4-(2*x) = 0
4-2*x = 0
4-2*x = 0 // - 4
-2*x = -4 // : -2
x = -4/(-2)
x = 2
x in (-oo:2) U (2:+oo)
(5*x-10)/(4-(2*x)) = 0
(5*x-10)/(4-2*x) = 0
5*x-10 = 0 // + 10
5*x = 10 // : 5
x = 10/5
x = 2
x in { 2}
x belongs to the empty set
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