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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)
(3*x-14)/(x-5) = 0
3*x-14 = 0 // + 14
3*x = 14 // : 3
x = 14/3
x = 14/3
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