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