Apple orchards

Five farmers have 7, 9, 11, 13 and 14 apple trees in their orchards.

Last year each of them discovered that every tree in their own orchard bore exactly the same number of apples.

Further if the 3rd farmer gives one apple to the first, the 5th  gives three apples to each of 2nd and 4th.

They would all have exactly the same number of apples.

What was the yield per tree in the orchards of the 3rd and 4th farmers?

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