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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
(2*x-9)/(x-5) = 0
2*x-9 = 0 // + 9
2*x = 9 // : 2
x = 9/2
x = 9/2
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