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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50 = 0.6/x // - 0.6/x
50-(0.6/x) = 0
50-0.6*x^-1 = 0
-0.6*x^-1 = -50 // : -0.6
x^-1 = 83.33333333
-1 < 0
1/(x^1) = 83.33333333 // * x^1
1 = 83.33333333*x^1 // : 83.33333333
0.012 = x^1
x = 0.012
x = 0.012
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