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D( a )
a = 0
a = 0
a = 0
a in (-oo:0) U (0:+oo)
3/a+1 = -3/a-3 // + -3/a-3
3/a-(-3/a)+1+3 = 0
3/a+3*a^-1+1+3 = 0
6*a^-1 = -4 // : 6
a^-1 = -2/3
-1 < 0
1/(a^1) = -2/3 // * a^1
1 = -2/3*a^1 // : -2/3
-3/2 = a^1
a = -3/2
a = -3/2
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