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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.5 = 102-(100/x) // - 102-(100/x)
100/x-102+2.5 = 0
100*x^-1 = 99.5 // : 100
x^-1 = 0.995
-1 < 0
1/(x^1) = 0.995 // * x^1
1 = 0.995*x^1 // : 0.995
1.00502513 = x^1
x = 1.00502513
x = 1.00502513
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