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D( x )
9*x-28 = 0
9*x-28 = 0
9*x-28 = 0
9*x-28 = 0 // + 28
9*x = 28 // : 9
x = 28/9
x in (-oo:28/9) U (28/9:+oo)
29/(9*x-28) = 0
x belongs to the empty set
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