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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-1 = 6/7 // - 6/7
2/x-(6/7)-1 = 0
2/x-6/7-1 = 0
2*x^-1 = 13/7 // : 2
x^-1 = 13/14
-1 < 0
1/(x^1) = 13/14 // * x^1
1 = 13/14*x^1 // : 13/14
14/13 = x^1
x = 14/13
x = 14/13
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