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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 0.6 // - 0.6
11/x-0.6 = 0
11*x^-1 = 0.6 // : 11
x^-1 = 0.05454545
-1 < 0
1/(x^1) = 0.05454545 // * x^1
1 = 0.05454545*x^1 // : 0.05454545
18.33333486 = x^1
x = 18.33333486
x = 18.33333486
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