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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/5 = 10.284-(x/x) // - 10.284-(x/x)
x/x+7/5-10.284 = 0
-7.884 = 0
x belongs to the empty set
x belongs to the empty set
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