Hiding rows based on a user input box

Hi All,

I've come up with the following bit of code whihch is to be used to hide rows based on a user input box:

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The bit ive underline is the bit i'm struggling with. I basically want it to hide from the number the user has entered + 6 rows so if they enter 20 it would hide rows 26:56

Can anyone help? Thanks in advance.

Try:

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