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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/5)/x = 2/0.8 // - 2/0.8
(4/5)/x-(2/0.8) = 0
(4/5)/x-2.5 = 0
4/5*x^-1 = 2.5 // : 4/5
x^-1 = 3.125
-1 < 0
1/(x^1) = 3.125 // * x^1
1 = 3.125*x^1 // : 3.125
0.32 = x^1
x = 0.32
x = 0.32
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