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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/9 = 2/a // - 2/a
6/9-(2/a) = 0
6/9-2*a^-1 = 0
-2*a^-1 = -2/3 // : -2
a^-1 = 1/3
-1 < 0
1/(a^1) = 1/3 // * a^1
1 = 1/3*a^1 // : 1/3
3 = a^1
a = 3
a = 3
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