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