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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
6/a = 4/3 // - 4/3
6/a-(4/3) = 0
6/a-4/3 = 0
6*a^-1 = 4/3 // : 6
a^-1 = 2/9
-1 < 0
1/(a^1) = 2/9 // * a^1
1 = 2/9*a^1 // : 2/9
9/2 = a^1
a = 9/2
a = 9/2
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