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