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