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