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