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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 8/7 // - 8/7
6/x-(8/7) = 0
6/x-8/7 = 0
6*x^-1 = 8/7 // : 6
x^-1 = 4/21
-1 < 0
1/(x^1) = 4/21 // * x^1
1 = 4/21*x^1 // : 4/21
21/4 = x^1
x = 21/4
x = 21/4
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