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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)
(-2*x)/(12*x) = 0
-1/6 = 0
x belongs to the empty set
x belongs to the empty set
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