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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-2 = 14/16 // - 14/16
7/x-(14/16)-2 = 0
7/x-7/8-2 = 0
7*x^-1 = 23/8 // : 7
x^-1 = 23/56
-1 < 0
1/(x^1) = 23/56 // * x^1
1 = 23/56*x^1 // : 23/56
56/23 = x^1
x = 56/23
x = 56/23
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