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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/3 = 0.8/x // - 0.8/x
2/3-(0.8/x) = 0
2/3-0.8*x^-1 = 0
-0.8*x^-1 = -2/3 // : -0.8
x^-1 = 0.83333334
-1 < 0
1/(x^1) = 0.83333334 // * x^1
1 = 0.83333334*x^1 // : 0.83333334
1.19999999 = x^1
x = 1.19999999
x = 1.19999999
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