The answer to 7x7 is 49.
Another times (x) sum that equals 49 is:
1x49
There are other sums that equal 49, but I have not typed them.
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the sum of 18 and a number equals 24
the sum equals x+10
If the sum of the digits of a given number equals nine or a multiple of nine, nine is a factor of that number.
The sum of the digits in 252 is 2 + 5 + 2 which equals 9.
the 7x7 rule means theres no more then 7 bullets on a slide and no more then 7 sentences on a slide