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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
12/a-(8/5) = 0
12/a-8/5 = 0
12*a^-1 = 8/5 // : 12
a^-1 = 2/15
-1 < 0
1/(a^1) = 2/15 // * a^1
1 = 2/15*a^1 // : 2/15
15/2 = a^1
a = 15/2
a = 15/2
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