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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.15 = 0.00194672/x // - 0.00194672/x
0.15-(0.00194672/x) = 0
0.15-0.00194672*x^-1 = 0
-0.00194672*x^-1 = -0.15 // : -0.00194672
x^-1 = 77.05268349
-1 < 0
1/(x^1) = 77.05268349 // * x^1
1 = 77.05268349*x^1 // : 77.05268349
0.01297813 = x^1
x = 0.01297813
x = 0.01297813
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