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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5-(x/x)+15 = 30 // - 30
5-(x/x)-30+15 = 0
5-30-1+15 = 0
-11 = 0
x belongs to the empty set
x belongs to the empty set
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