How to apply a ex-cmd to all buffers currently displayed

Hi,

I have the vimdiff of two files open.

As the diffed lines of some kind are not interesting in the moment,
I want to g/<pattern>/d them out of the way on both windows.

How can I apply the command to both, without entering the cmd
again and without affecting any othe buffer?

Thank you very much in advance for any help! :)

Let's vim the world! :)))))
Best regards,
mcc

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