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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/13 = 14/x // - 14/x
3/13-(14/x) = 0
3/13-14*x^-1 = 0
-14*x^-1 = -3/13 // : -14
x^-1 = 3/182
-1 < 0
1/(x^1) = 3/182 // * x^1
1 = 3/182*x^1 // : 3/182
182/3 = x^1
x = 182/3
x = 182/3
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