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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 2.5/100 // - 2.5/100
15/x-(2.5/100) = 0
15/x-0.025 = 0
15*x^-1 = 0.025 // : 15
x^-1 = 0.00166667
-1 < 0
1/(x^1) = 0.00166667 // * x^1
1 = 0.00166667*x^1 // : 0.00166667
599.9988 = x^1
x = 599.9988
x = 599.9988
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