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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 0.133 // - 0.133
10/x-0.133 = 0
10*x^-1 = 0.133 // : 10
x^-1 = 0.0133
-1 < 0
1/(x^1) = 0.0133 // * x^1
1 = 0.0133*x^1 // : 0.0133
75.18796992 = x^1
x = 75.18796992
x = 75.18796992
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