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