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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x+6 = -2 // + 2
2/x+2+6 = 0
2*x^-1 = -8 // : 2
x^-1 = -4
-1 < 0
1/(x^1) = -4 // * x^1
1 = -4*x^1 // : -4
-1/4 = x^1
x = -1/4
x = -1/4
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