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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3/a = 8/36 // - 8/36
3/a-(8/36) = 0
3/a-2/9 = 0
3*a^-1 = 2/9 // : 3
a^-1 = 2/27
-1 < 0
1/(a^1) = 2/27 // * a^1
1 = 2/27*a^1 // : 2/27
27/2 = a^1
a = 27/2
a = 27/2
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