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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
50000 = 300/x // - 300/x
50000-(300/x) = 0
50000-300*x^-1 = 0
-300*x^-1 = -50000 // : -300
x^-1 = 500/3
-1 < 0
1/(x^1) = 500/3 // * x^1
1 = 500/3*x^1 // : 500/3
3/500 = x^1
x = 3/500
x = 3/500
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