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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.25/x = 0.4545454545 // - 0.4545454545
4.25/x-0.4545454545 = 0
4.25*x^-1 = 0.4545454545 // : 4.25
x^-1 = 0.10695187
-1 < 0
1/(x^1) = 0.10695187 // * x^1
1 = 0.10695187*x^1 // : 0.10695187
9.35000014 = x^1
x = 9.35000014
x = 9.35000014
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