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