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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.45/x = 2.05 // - 2.05
0.45/x-2.05 = 0
0.45*x^-1 = 2.05 // : 0.45
x^-1 = 4.55555556
-1 < 0
1/(x^1) = 4.55555556 // * x^1
1 = 4.55555556*x^1 // : 4.55555556
0.21951219 = x^1
x = 0.21951219
x = 0.21951219
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