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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
24 = 2/a // - 2/a
24-(2/a) = 0
24-2*a^-1 = 0
-2*a^-1 = -24 // : -2
a^-1 = 12
-1 < 0
1/(a^1) = 12 // * a^1
1 = 12*a^1 // : 12
1/12 = a^1
a = 1/12
a = 1/12
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