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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)
(4*a-4)/(3*a+3) = 0
4*a-4 = 0 // + 4
4*a = 4 // : 4
a = 4/4
a = 1
a = 1
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