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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
1/a = 8/5 // - 8/5
1/a-(8/5) = 0
1/a-8/5 = 0
1*a^-1 = 8/5 // : 1
a^-1 = 8/5
-1 < 0
1/(a^1) = 8/5 // * a^1
1 = 8/5*a^1 // : 8/5
5/8 = a^1
a = 5/8
a = 5/8
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