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