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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
7/x = 0.181 // - 0.181
7/x-0.181 = 0
7*x^-1 = 0.181 // : 7
x^-1 = 0.02585714
-1 < 0
1/(x^1) = 0.02585714 // * x^1
1 = 0.02585714*x^1 // : 0.02585714
38.67403742 = x^1
x = 38.67403742
x = 38.67403742
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