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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.5 = (9*x)/x+13 // - (9*x)/x+13
3.5-((9*x)/x)-13 = 0
3.5-13-9 = 0
-18.5 = 0
x belongs to the empty set
x belongs to the empty set
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