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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/7 = 11/x // - 11/x
3/7-(11/x) = 0
3/7-11*x^-1 = 0
-11*x^-1 = -3/7 // : -11
x^-1 = 3/77
-1 < 0
1/(x^1) = 3/77 // * x^1
1 = 3/77*x^1 // : 3/77
77/3 = x^1
x = 77/3
x = 77/3
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