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