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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
12/a = 11/7 // - 11/7
12/a-(11/7) = 0
12/a-11/7 = 0
12*a^-1 = 11/7 // : 12
a^-1 = 11/84
-1 < 0
1/(a^1) = 11/84 // * a^1
1 = 11/84*a^1 // : 11/84
84/11 = a^1
a = 84/11
a = 84/11
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