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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5-2/x = 8/x-3 // - 8/x-3
3-2/x-(8/x)+5 = 0
3-2/x-8*x^-1+5 = 0
-10*x^-1 = -8 // : -10
x^-1 = 4/5
-1 < 0
1/(x^1) = 4/5 // * x^1
1 = 4/5*x^1 // : 4/5
5/4 = x^1
x = 5/4
x = 5/4
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