How to answer 5.17.21.25

Single digit plus ten digit becomes 5 8 3 7 (4) 5 + 3 = 8 3 + 4 = 7, that is odd item plus ten digit = even item plus ten digit
The answer of LS is wrong. If you take out 5, it can be 29, which becomes 17 21 25 29 4

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