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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-8 = 7/x+6 // - 7/x+6
2/x-(7/x)-8-6 = 0
2/x-7*x^-1-8-6 = 0
-5*x^-1 = 14 // : -5
x^-1 = -14/5
-1 < 0
1/(x^1) = -14/5 // * x^1
1 = -14/5*x^1 // : -14/5
-5/14 = x^1
x = -5/14
x = -5/14
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