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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x+2 = 3/x+2+6 // - 3/x+2+6
x/x-(3/x)-6-2+2 = 0
x/x-3*x^-1-6-2+2 = 0
-3*x^-1 = 5 // : -3
x^-1 = -5/3
-1 < 0
1/(x^1) = -5/3 // * x^1
1 = -5/3*x^1 // : -5/3
-3/5 = x^1
x = -3/5
x = -3/5
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