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D( x )
x-4 = 0
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(5*x-7)/(x-4) = 0
5*x-7 = 0 // + 7
5*x = 7 // : 5
x = 7/5
x = 7/5
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