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D( x )
8*x-6 = 0
8*x-6 = 0
8*x-6 = 0
8*x-6 = 0 // + 6
8*x = 6 // : 8
x = 6/8
x = 3/4
x in (-oo:3/4) U (3/4:+oo)
(x-3)/(8*x-6) = 0
x-3 = 0 // + 3
x = 3
x = 3
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