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