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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/7)/x = 6/7 // - 6/7
(4/7)/x-(6/7) = 0
(4/7)/x-6/7 = 0
4/7*x^-1 = 6/7 // : 4/7
x^-1 = 3/2
-1 < 0
1/(x^1) = 3/2 // * x^1
1 = 3/2*x^1 // : 3/2
2/3 = x^1
x = 2/3
x = 2/3
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