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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)
(5-x)/(2*x-4) = 0
5-x = 0 // - 5
-x = -5 // * -1
x = 5
x = 5
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