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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 7/8 // - 7/8
11/x-(7/8) = 0
11/x-7/8 = 0
11*x^-1 = 7/8 // : 11
x^-1 = 7/88
-1 < 0
1/(x^1) = 7/88 // * x^1
1 = 7/88*x^1 // : 7/88
88/7 = x^1
x = 88/7
x = 88/7
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