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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/0.19 = 12/x // - 12/x
1/0.19-(12/x) = 0
1/0.19-12*x^-1 = 0
-12*x^-1 = -5.26315789 // : -12
x^-1 = 0.43859649
-1 < 0
1/(x^1) = 0.43859649 // * x^1
1 = 0.43859649*x^1 // : 0.43859649
2.28000001 = x^1
x = 2.28000001
x = 2.28000001
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