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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-9)/(2*x-4) = 0
5*x-9 = 0 // + 9
5*x = 9 // : 5
x = 9/5
x = 9/5
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