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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/15 = 0.2/x // - 0.2/x
1/15-(0.2/x) = 0
1/15-0.2*x^-1 = 0
-0.2*x^-1 = -1/15 // : -0.2
x^-1 = 0.33333335
-1 < 0
1/(x^1) = 0.33333335 // * x^1
1 = 0.33333335*x^1 // : 0.33333335
2.99999985 = x^1
x = 2.99999985
x = 2.99999985
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