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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3/a = 1/6 // - 1/6
3/a-(1/6) = 0
3/a-1/6 = 0
3*a^-1 = 1/6 // : 3
a^-1 = 1/18
-1 < 0
1/(a^1) = 1/18 // * a^1
1 = 1/18*a^1 // : 1/18
18 = a^1
a = 18
a = 18
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