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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9/1)/7 = 14/x // - 14/x
(9/1)/7-(14/x) = 0
9/7-14*x^-1 = 0
-14*x^-1 = -9/7 // : -14
x^-1 = 9/98
-1 < 0
1/(x^1) = 9/98 // * x^1
1 = 9/98*x^1 // : 9/98
98/9 = x^1
x = 98/9
x = 98/9
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