Question
Find the missing number, if a certain rule is followed either row-wise or column-wise.
| $12$ | $8$ | $20$ |
| $7$ | $?$ | $25$ |
| $15$ | $6$ | $21$ |
| $12$ | $8$ | $20$ |
| $7$ | $?$ | $25$ |
| $15$ | $6$ | $21$ |
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