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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10 = (2*x)/x-2 // - (2*x)/x-2
2-((2*x)/x)+10 = 0
2-2+10 = 0
10 = 0
x belongs to the empty set
x belongs to the empty set
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