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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.4/x = 2/3 // - 2/3
6.4/x-(2/3) = 0
6.4/x-2/3 = 0
6.4*x^-1 = 2/3 // : 6.4
x^-1 = 0.10416667
-1 < 0
1/(x^1) = 0.10416667 // * x^1
1 = 0.10416667*x^1 // : 0.10416667
9.59999969 = x^1
x = 9.59999969
x = 9.59999969
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