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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.08 = 15000/x // - 15000/x
1.08-(15000/x) = 0
1.08-15000*x^-1 = 0
-15000*x^-1 = -1.08 // : -15000
x^-1 = 0.000072
-1 < 0
1/(x^1) = 0.000072 // * x^1
1 = 0.000072*x^1 // : 0.000072
13888.88888889 = x^1
x = 13888.88888889
x = 13888.88888889
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