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D( x )
6*x-11 = 0
6*x-11 = 0
6*x-11 = 0
6*x-11 = 0 // + 11
6*x = 11 // : 6
x = 11/6
x in (-oo:11/6) U (11/6:+oo)
(9*x)/(6*x-11) = 0
9*x = 0 // : 9
x = 0
x = 0
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