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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2*x-((12*x)/x)-6 = 0
2*x-12-6 = 0
2*x-18 = 0 // + 18
2*x = 18 // : 2
x = 18/2
x = 9
x = 9
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