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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
27/a = 9/14 // - 9/14
27/a-(9/14) = 0
27/a-9/14 = 0
27*a^-1 = 9/14 // : 27
a^-1 = 1/42
-1 < 0
1/(a^1) = 1/42 // * a^1
1 = 1/42*a^1 // : 1/42
42 = a^1
a = 42
a = 42
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