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D( x )
8*x-5 = 0
8*x-5 = 0
8*x-5 = 0
8*x-5 = 0 // + 5
8*x = 5 // : 8
x = 5/8
x in (-oo:5/8) U (5/8:+oo)
(3*x-9)/(8*x-5) = 0
3*x-9 = 0 // + 9
3*x = 9 // : 3
x = 9/3
x = 3
x = 3
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