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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x-7 = 1 // - 1
7/x-7-1 = 0
7*x^-1 = 8 // : 7
x^-1 = 8/7
-1 < 0
1/(x^1) = 8/7 // * x^1
1 = 8/7*x^1 // : 8/7
7/8 = x^1
x = 7/8
x = 7/8
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