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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/7 = 9/x // - 9/x
11/7-(9/x) = 0
11/7-9*x^-1 = 0
-9*x^-1 = -11/7 // : -9
x^-1 = 11/63
-1 < 0
1/(x^1) = 11/63 // * x^1
1 = 11/63*x^1 // : 11/63
63/11 = x^1
x = 63/11
x = 63/11
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