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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(7*x-9)/(x-3) = 0
7*x-9 = 0 // + 9
7*x = 9 // : 7
x = 9/7
x = 9/7
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