We have a tree with two branches, the first above the second. A flock of birds descended upon her. If one of the birds descends from the first branch to the second branch, then the number of birds is equal between the two branches. And if one of the birds climbed from the second branch to the first. The number of birds in the first branch doubles the number of birds in the second branch. How many birds are in the first branch? Then the second?

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