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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)
(3*x-5)/(2*x-4) = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x = 5/3
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