How many birds in each tree?

Question

There are 2 trees at the exotic bird show (Tree "A" and "B")
and on both trees are some exotic birds.
The birds of tree A say to the birds of tree B,
that if one of you comes to our tree, then our population will be double yours.
Then the birds of tree B tell to the birds of tree A
that if one of you comes here, then our population will be equal to that of yours..

How many birds in each tree?

Answer 1

A has 7 and B has 5

Answer 2

A)11111=5 B)1111111=7
A)11111-1=4 B)1+1111111=8 , hence 4,8 i.e 8=2*4

A)11111+1=6 B)1111111-1=6 ... 6=6