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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.38/3.785 = 5/x // - 5/x
1.38/3.785-(5/x) = 0
1.38/3.785-5*x^-1 = 0
-5*x^-1 = -0.36459709 // : -5
x^-1 = 0.07291942
-1 < 0
1/(x^1) = 0.07291942 // * x^1
1 = 0.07291942*x^1 // : 0.07291942
13.71376788 = x^1
x = 13.71376788
x = 13.71376788
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