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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x = 12-((6*x)/x)-5 // - 12-((6*x)/x)-5
x+(6*x)/x-12+5 = 0
x-1 = 0 // + 1
x = 1
x = 1
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