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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
12/a = 132/35 // - 132/35
12/a-(132/35) = 0
12/a-132/35 = 0
12*a^-1 = 132/35 // : 12
a^-1 = 11/35
-1 < 0
1/(a^1) = 11/35 // * a^1
1 = 11/35*a^1 // : 11/35
35/11 = a^1
a = 35/11
a = 35/11
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