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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
8/a = 30/23 // - 30/23
8/a-(30/23) = 0
8/a-30/23 = 0
8*a^-1 = 30/23 // : 8
a^-1 = 15/92
-1 < 0
1/(a^1) = 15/92 // * a^1
1 = 15/92*a^1 // : 15/92
92/15 = a^1
a = 92/15
a = 92/15
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