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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/5-(3/x) = 8/x-5 // - 8/x-5
8/5-(3/x)-(8/x)+5 = 0
8/5-3*x^-1-8*x^-1+5 = 0
-11*x^-1 = -33/5 // : -11
x^-1 = 3/5
-1 < 0
1/(x^1) = 3/5 // * x^1
1 = 3/5*x^1 // : 3/5
5/3 = x^1
x = 5/3
x = 5/3
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