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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x-8 = 20 // - 20
2/x-20-8 = 0
2*x^-1 = 28 // : 2
x^-1 = 14
-1 < 0
1/(x^1) = 14 // * x^1
1 = 14*x^1 // : 14
1/14 = x^1
x = 1/14
x = 1/14
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