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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(26.94/x) = 0.25 // - 0.25
1-(26.94/x)-0.25 = 0
1-26.94*x^-1-0.25 = 0
-26.94*x^-1 = -0.75 // : -26.94
x^-1 = 0.02783964
-1 < 0
1/(x^1) = 0.02783964 // * x^1
1 = 0.02783964*x^1 // : 0.02783964
35.92000471 = x^1
x = 35.92000471
x = 35.92000471
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