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