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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
2/6 = 8/a // - 8/a
2/6-(8/a) = 0
2/6-8*a^-1 = 0
-8*a^-1 = -1/3 // : -8
a^-1 = 1/24
-1 < 0
1/(a^1) = 1/24 // * a^1
1 = 1/24*a^1 // : 1/24
24 = a^1
a = 24
a = 24
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