SUMIF+LEN based on criteria

Hello folks,
I am trying to figure out this formula but still haven't found solution
I will try to explain my problem here if you don't want to download excel file.

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So, I need to SUM only cells where I have "x" or "xx". In this case my SUM should give me =3 as total.

Thanks in advance!

Try:

=SUMPRODUCT(LEN(A2:D2)-LEN(SUBSTITUTE(A2:D2,"x","")))

Yeap, that's it.

Thank you very much!