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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+8/x+3 = x+10/13 // - x+10/13
x-x+8/x-(10/13)+3 = 0
x-x+8/x-10/13+3 = 0
8*x^-1 = -29/13 // : 8
x^-1 = -29/104
-1 < 0
1/(x^1) = -29/104 // * x^1
1 = -29/104*x^1 // : -29/104
-104/29 = x^1
x = -104/29
x = -104/29
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