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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-6 = x+8/x+3 // - x+8/x+3
x-x-(8/x)-6-3 = 0
x-x-8*x^-1-6-3 = 0
-8*x^-1 = 9 // : -8
x^-1 = -9/8
-1 < 0
1/(x^1) = -9/8 // * x^1
1 = -9/8*x^1 // : -9/8
-8/9 = x^1
x = -8/9
x = -8/9
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