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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/x = 11/20 // - 11/20
9/x-(11/20) = 0
9/x-11/20 = 0
9*x^-1 = 11/20 // : 9
x^-1 = 11/180
-1 < 0
1/(x^1) = 11/180 // * x^1
1 = 11/180*x^1 // : 11/180
180/11 = x^1
x = 180/11
x = 180/11
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