I change my Macbook Pro (2016) for new 2017, but i forget to erase the auth from the old one, what can i do?

I change my Macbook Pro (2016) for new 2017, but i forget to erase the auth from the old one, what can i do?

The authorization only can be erased o deactivated from the original computer, but i formated it to sell.

Hi @numanmania,
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