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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
(2*2)/a = 12 // - 12
(2*2)/a-12 = 0
4*a^-1 = 12 // : 4
a^-1 = 3
-1 < 0
1/(a^1) = 3 // * a^1
1 = 3*a^1 // : 3
1/3 = a^1
a = 1/3
a = 1/3
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