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D( x )
4*x-5 = 0
4*x-5 = 0
4*x-5 = 0
4*x-5 = 0 // + 5
4*x = 5 // : 4
x = 5/4
x in (-oo:5/4) U (5/4:+oo)
(3*x-2)/(4*x-5) = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x = 2/3
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