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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
5/8 = 16/a // - 16/a
5/8-(16/a) = 0
5/8-16*a^-1 = 0
-16*a^-1 = -5/8 // : -16
a^-1 = 5/128
-1 < 0
1/(a^1) = 5/128 // * a^1
1 = 5/128*a^1 // : 5/128
128/5 = a^1
a = 128/5
a = 128/5
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