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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.12 = (0.1*1000)/x // - (0.1*1000)/x
0.12-((0.1*1000)/x) = 0
0.12-100*x^-1 = 0
-100*x^-1 = -0.12 // : -100
x^-1 = 0.0012
-1 < 0
1/(x^1) = 0.0012 // * x^1
1 = 0.0012*x^1 // : 0.0012
833.33333333 = x^1
x = 833.33333333
x = 833.33333333
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