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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.79 = 1500/x // - 1500/x
0.79-(1500/x) = 0
0.79-1500*x^-1 = 0
-1500*x^-1 = -0.79 // : -1500
x^-1 = 0.00052667
-1 < 0
1/(x^1) = 0.00052667 // * x^1
1 = 0.00052667*x^1 // : 0.00052667
1898.72215999 = x^1
x = 1898.72215999
x = 1898.72215999
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