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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
-6/a = 11/9 // - 11/9
-6/a-(11/9) = 0
-6/a-11/9 = 0
-6*a^-1 = 11/9 // : -6
a^-1 = -11/54
-1 < 0
1/(a^1) = -11/54 // * a^1
1 = -11/54*a^1 // : -11/54
-54/11 = a^1
a = -54/11
a = -54/11
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