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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 1.211 // - 1.211
1/x-1.211 = 0
1*x^-1 = 1.211 // : 1
x^-1 = 1.211
-1 < 0
1/(x^1) = 1.211 // * x^1
1 = 1.211*x^1 // : 1.211
0.82576383 = x^1
x = 0.82576383
x = 0.82576383
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