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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.2/1 = 145/x // - 145/x
2.2/1-(145/x) = 0
2.2-145*x^-1 = 0
-145*x^-1 = -2.2 // : -145
x^-1 = 0.01517241
-1 < 0
1/(x^1) = 0.01517241 // * x^1
1 = 0.01517241*x^1 // : 0.01517241
65.90910739 = x^1
x = 65.90910739
x = 65.90910739
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