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D( x )
10*x-1 = 0
10*x-1 = 0
10*x-1 = 0
10*x-1 = 0 // + 1
10*x = 1 // : 10
x = 1/10
x in (-oo:1/10) U (1/10:+oo)
10/(10*x-1) = 0
10 = 0
x belongs to the empty set
x belongs to the empty set
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