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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
8/a-3 = 6 // - 6
8/a-6-3 = 0
8*a^-1 = 9 // : 8
a^-1 = 9/8
-1 < 0
1/(a^1) = 9/8 // * a^1
1 = 9/8*a^1 // : 9/8
8/9 = a^1
a = 8/9
a = 8/9
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