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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 0.06666 // - 0.06666
3/x-0.06666 = 0
3*x^-1 = 0.06666 // : 3
x^-1 = 0.02222
-1 < 0
1/(x^1) = 0.02222 // * x^1
1 = 0.02222*x^1 // : 0.02222
45.00450045 = x^1
x = 45.00450045
x = 45.00450045
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