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D( x )
9*x-4 = 0
9*x-4 = 0
9*x-4 = 0
9*x-4 = 0 // + 4
9*x = 4 // : 9
x = 4/9
x in (-oo:4/9) U (4/9:+oo)
(5*x-6)/(9*x-4) = 0
5*x-6 = 0 // + 6
5*x = 6 // : 5
x = 6/5
x = 6/5
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