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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
8/a-(8/4) = 0
8/a-2 = 0
8*a^-1 = 2 // : 8
a^-1 = 1/4
-1 < 0
1/(a^1) = 1/4 // * a^1
1 = 1/4*a^1 // : 1/4
4 = a^1
a = 4
a = 4
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