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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
164/52 = 1/x // - 1/x
164/52-(1/x) = 0
164/52-x^-1 = 0
-1*x^-1 = -41/13 // : -1
x^-1 = 41/13
-1 < 0
1/(x^1) = 41/13 // * x^1
1 = 41/13*x^1 // : 41/13
13/41 = x^1
x = 13/41
x = 13/41
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