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To find the original position of the endpoint, we need to reverse the translation.
To translate 3 units down, we need to move the point 3 units up.
To translate 1 unit to the left, we need to move the point 1 unit to the right.
So, the original position of the endpoint is (5 + 1, 8 - 3) = (6, 5).
Therefore, the point before the translation was (6, 5).