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