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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1000 = 15000000/x-230000 // - 15000000/x-230000
1000-(15000000/x)+230000 = 0
1000-15000000*x^-1+230000 = 0
-15000000*x^-1 = -231000 // : -15000000
x^-1 = 77/5000
-1 < 0
1/(x^1) = 77/5000 // * x^1
1 = 77/5000*x^1 // : 77/5000
5000/77 = x^1
x = 5000/77
x = 5000/77
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