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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9.5 = 10-(15/x) // - 10-(15/x)
15/x-10+9.5 = 0
15*x^-1 = 0.5 // : 15
x^-1 = 0.03333333
-1 < 0
1/(x^1) = 0.03333333 // * x^1
1 = 0.03333333*x^1 // : 0.03333333
30.000003 = x^1
x = 30.000003
x = 30.000003
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