Ron Rosenfeld wrote...
....
Assuming the leftmost column has priority if there are multiple X's, and
assuming the contents of the cell is only an X (and not, for example, eXcite),
then:

K7: =CHOOSE(MATCH("X",F7:F7:J7,0),5,4,3,2,1)

Yeah, but it's effectively hardcoded. insert columns between F and J
and put the leftmost X in the 6th column.

If hardcoding, zero return value for no X in the range, and array
formulas were OK,

=MAX(IF(F7:J7="X",{5,4,3,2,1}))