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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 1.33 // - 1.33
2/x-1.33 = 0
2*x^-1 = 1.33 // : 2
x^-1 = 0.665
-1 < 0
1/(x^1) = 0.665 // * x^1
1 = 0.665*x^1 // : 0.665
1.5037594 = x^1
x = 1.5037594
x = 1.5037594
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