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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/7 = 10/x-1 // - 10/x-1
6/7-(10/x)+1 = 0
6/7-10*x^-1+1 = 0
-10*x^-1 = -13/7 // : -10
x^-1 = 13/70
-1 < 0
1/(x^1) = 13/70 // * x^1
1 = 13/70*x^1 // : 13/70
70/13 = x^1
x = 70/13
x = 70/13
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