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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13/1 = 0.3/x // - 0.3/x
13/1-(0.3/x) = 0
13-0.3*x^-1 = 0
-0.3*x^-1 = -13 // : -0.3
x^-1 = 43.33333333
-1 < 0
1/(x^1) = 43.33333333 // * x^1
1 = 43.33333333*x^1 // : 43.33333333
0.02307692 = x^1
x = 0.02307692
x = 0.02307692
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