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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20-(x/x) = 3/2 // - 3/2
20-(x/x)-(3/2) = 0
20-3/2-1 = 0
35/2 = 0
x belongs to the empty set
x belongs to the empty set
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