Search and replace

Hi all,
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I´ve made the formula below for a weekly followup worksheet, the formula is therefor present in 52 sheets and I need to remove the "week part" from the formula. Thing is I have from week 1 to week 52, the rest of the formula is the same.
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how do I remove the highlighted part without having to go through all 52 sheets?
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=(IF(F7="";0;F7-E7)+IF(F9="";0;F9-E9)+IF(F11="";0;F11-E11)+IF(F13="";0;F13-E13)+IF(F15="";0;F15-E15)+IF(F17="";0;F17-E17)+IF(F19="";0;F19-E19)+IF(F21="";0;F21-E21))-'week 1'!K6
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Thanks in advance!
xlsmNewbie

Thank you for your inputs.

Glenn, Just as Paul mentioned the sheets are named from week 1 to week 52, otherwise as you posted ctrl-H would´ve worked

Paul, Thank you for the link, I looked into it but found a simpler way. By ctrl + selecting each sheet with the formula present I could change the formula in the first sheet and they would change in the other 52 aswell. The sheets do need to be identical though, which luckily they are.

Again thx for your inputs!