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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 13/7 // - 13/7
3/x-(13/7) = 0
3/x-13/7 = 0
3*x^-1 = 13/7 // : 3
x^-1 = 13/21
-1 < 0
1/(x^1) = 13/21 // * x^1
1 = 13/21*x^1 // : 13/21
21/13 = x^1
x = 21/13
x = 21/13
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