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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4.5/1.1 = 9/x // - 9/x
4.5/1.1-(9/x) = 0
4.5/1.1-9*x^-1 = 0
-9*x^-1 = -4.09090909 // : -9
x^-1 = 0.45454545
-1 < 0
1/(x^1) = 0.45454545 // * x^1
1 = 0.45454545*x^1 // : 0.45454545
2.20000002 = x^1
x = 2.20000002
x = 2.20000002
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