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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 4/6 // - 4/6
7/x-(4/6) = 0
7/x-2/3 = 0
7*x^-1 = 2/3 // : 7
x^-1 = 2/21
-1 < 0
1/(x^1) = 2/21 // * x^1
1 = 2/21*x^1 // : 2/21
21/2 = x^1
x = 21/2
x = 21/2
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