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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-30 = 100/20 // - 100/20
x/x-(100/20)-30 = 0
x/x-30-5 = 0
-34 = 0
x belongs to the empty set
x belongs to the empty set
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