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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-4+9 = (6*x)/x-4 // - (6*x)/x-4
x/x-((6*x)/x)-4+4+9 = 0
x/x-6-4+4+9 = 0
4 = 0
x belongs to the empty set
x belongs to the empty set
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