Find the matching value from a list

I

iamjbunni

I have a list of numbers and I need to match the number with the rest of the
information. For example:

123 891
651 456
456 789
789 421
320

I need a formula that will find the matching number and place in the column
next to it, or highlight the position of the matching number:


123 891
651 456 456
456 789 789
789 421
320
123 123
 
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