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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(12.63/x) = 0.25 // - 0.25
1-(12.63/x)-0.25 = 0
1-12.63*x^-1-0.25 = 0
-12.63*x^-1 = -0.75 // : -12.63
x^-1 = 0.05938242
-1 < 0
1/(x^1) = 0.05938242 // * x^1
1 = 0.05938242*x^1 // : 0.05938242
16.84000079 = x^1
x = 16.84000079
x = 16.84000079
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