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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
88/x = 8 // - 8
88/x-8 = 0
88*x^-1 = 8 // : 88
x^-1 = 1/11
-1 < 0
1/(x^1) = 1/11 // * x^1
1 = 1/11*x^1 // : 1/11
11 = x^1
x = 11
x = 11
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