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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2/7)/x = 4/9 // - 4/9
(2/7)/x-(4/9) = 0
(2/7)/x-4/9 = 0
2/7*x^-1 = 4/9 // : 2/7
x^-1 = 14/9
-1 < 0
1/(x^1) = 14/9 // * x^1
1 = 14/9*x^1 // : 14/9
9/14 = x^1
x = 9/14
x = 9/14
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