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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
4/6 = 24/a // - 24/a
4/6-(24/a) = 0
4/6-24*a^-1 = 0
-24*a^-1 = -2/3 // : -24
a^-1 = 1/36
-1 < 0
1/(a^1) = 1/36 // * a^1
1 = 1/36*a^1 // : 1/36
36 = a^1
a = 36
a = 36
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