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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1500/x = 0.03 // - 0.03
1500/x-0.03 = 0
1500*x^-1 = 0.03 // : 1500
x^-1 = 0.00002
-1 < 0
1/(x^1) = 0.00002 // * x^1
1 = 0.00002*x^1 // : 0.00002
50000 = x^1
x = 50000
x = 50000
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