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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
8/a-(9/5) = 0
8/a-9/5 = 0
8*a^-1 = 9/5 // : 8
a^-1 = 9/40
-1 < 0
1/(a^1) = 9/40 // * a^1
1 = 9/40*a^1 // : 9/40
40/9 = a^1
a = 40/9
a = 40/9
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