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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.7-(x/x) = 0.938462 // - 0.938462
2.7-(x/x)-0.938462 = 0
2.7-1-0.938462 = 0
0.761538 = 0
x belongs to the empty set
x belongs to the empty set
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