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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/11 = 7/x // - 7/x
8/11-(7/x) = 0
8/11-7*x^-1 = 0
-7*x^-1 = -8/11 // : -7
x^-1 = 8/77
-1 < 0
1/(x^1) = 8/77 // * x^1
1 = 8/77*x^1 // : 8/77
77/8 = x^1
x = 77/8
x = 77/8
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