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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/11 = 8/x // - 8/x
3/11-(8/x) = 0
3/11-8*x^-1 = 0
-8*x^-1 = -3/11 // : -8
x^-1 = 3/88
-1 < 0
1/(x^1) = 3/88 // * x^1
1 = 3/88*x^1 // : 3/88
88/3 = x^1
x = 88/3
x = 88/3
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