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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
11/a = 6/7 // - 6/7
11/a-(6/7) = 0
11/a-6/7 = 0
11*a^-1 = 6/7 // : 11
a^-1 = 6/77
-1 < 0
1/(a^1) = 6/77 // * a^1
1 = 6/77*a^1 // : 6/77
77/6 = a^1
a = 77/6
a = 77/6
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