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D( x )
12*x = 0
12*x = 0
12*x = 0
12*x = 0 // : 12
x = 0
x in (-oo:0) U (0:+oo)
(16*x^2)/(12*x) = 0
4/3*x = 0 // : 4/3
x = 0
x in { 0}
x belongs to the empty set
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