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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
11/a = 9/17 // - 9/17
11/a-(9/17) = 0
11/a-9/17 = 0
11*a^-1 = 9/17 // : 11
a^-1 = 9/187
-1 < 0
1/(a^1) = 9/187 // * a^1
1 = 9/187*a^1 // : 9/187
187/9 = a^1
a = 187/9
a = 187/9
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