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D( x )
8*x-9 = 0
8*x-9 = 0
8*x-9 = 0
8*x-9 = 0 // + 9
8*x = 9 // : 8
x = 9/8
x in (-oo:9/8) U (9/8:+oo)
(3*x-6)/(8*x-9) = 0
3*x-6 = 0 // + 6
3*x = 6 // : 3
x = 6/3
x = 2
x = 2
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