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