(x - 7)(x - 9)
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(8b + 7)(7b + 9)
6 plus 6 plus 63 plus 63 plus 36 plus 36 is equal to 210.
50 + 63 + 72 + 63 + 137 + 172 = 557
Yes, 7 is a factor of 63. The factors of 63 are 1, 3, 7, 9, 21, and 63.
The greatest common factor is 63