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Can’t figure out how to build UPC-a check digit function

So for work I need to build a function in Libreoffice calc or excel that can calculate a UPC-A barcode check digit. And I cannot for the life of me figure out that function

SOLVED:

=MOD(-SUM(WRAPROWS(--REGEXEXTRACT(REPT("0",18-LEN(A1))&A1,".",1),2,0)*{1,3}),10)

That is the function for an 11 digit upc-a

submitted by /u/jasmynn24
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