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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9-x/x-4 = (6*x)/x-4 // - (6*x)/x-4
4-x/x-((6*x)/x)-4+9 = 0
4-x/x-6-4+9 = 0
2 = 0
x belongs to the empty set
x belongs to the empty set
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