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D( x )
5*x-9 = 0
5*x-9 = 0
5*x-9 = 0
5*x-9 = 0 // + 9
5*x = 9 // : 5
x = 9/5
x in (-oo:9/5) U (9/5:+oo)
(7*x-1)/(5*x-9) = 0
7*x-1 = 0 // + 1
7*x = 1 // : 7
x = 1/7
x = 1/7
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