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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(5.5/x) = 0.25 // - 0.25
1-(5.5/x)-0.25 = 0
1-5.5*x^-1-0.25 = 0
-5.5*x^-1 = -0.75 // : -5.5
x^-1 = 0.13636364
-1 < 0
1/(x^1) = 0.13636364 // * x^1
1 = 0.13636364*x^1 // : 0.13636364
7.33333314 = x^1
x = 7.33333314
x = 7.33333314
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