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D( x )
x-7 = 0
x-7 = 0
x-7 = 0
x-7 = 0 // + 7
x = 7
x in (-oo:7) U (7:+oo)
(5*x-2)/(x-7) = 0
5*x-2 = 0 // + 2
5*x = 2 // : 5
x = 2/5
x = 2/5
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