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7x2 + y
7(x-5)^2
(7x + 5)(x - 2)
Start by adding 7, then add 7x2, then 7x4, then 7x8, etc. 2 + (7x1) = 9 9 + (7x2) = 23 23 + (7x4) = 51 51 + (7x8) = 107 The next number is 219.
Assuming the missing operational signs are pluses, the answer is (x + 7)(7x + 1)