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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(1/x) = 2.25 // - 2.25
1-(1/x)-2.25 = 0
1-x^-1-2.25 = 0
-1*x^-1 = 1.25 // : -1
x^-1 = -1.25
-1 < 0
1/(x^1) = -1.25 // * x^1
1 = -1.25*x^1 // : -1.25
-0.8 = x^1
x = -0.8
x = -0.8
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