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D( x )
6*x = 0
6*x = 0
6*x = 0
6*x = 0 // : 6
x = 0
x in (-oo:0) U (0:+oo)
(16*x)/(6*x) = 2 // - 2
(16*x)/(6*x)-2 = 0
2/3 = 0
x belongs to the empty set
x belongs to the empty set
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