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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.9 = 30000/x // - 30000/x
0.9-(30000/x) = 0
0.9-30000*x^-1 = 0
-30000*x^-1 = -0.9 // : -30000
x^-1 = 0.00003
-1 < 0
1/(x^1) = 0.00003 // * x^1
1 = 0.00003*x^1 // : 0.00003
33333.33333333 = x^1
x = 33333.33333333
x = 33333.33333333
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