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