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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/11 = 10/x // - 10/x
5/11-(10/x) = 0
5/11-10*x^-1 = 0
-10*x^-1 = -5/11 // : -10
x^-1 = 1/22
-1 < 0
1/(x^1) = 1/22 // * x^1
1 = 1/22*x^1 // : 1/22
22 = x^1
x = 22
x = 22
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