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2(x + 13)
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x2+2x-63 = (x-7)(x+9) when factored
The difference of two squares a2 - b2 factors to (a - b)(a + b)
(5x - 3)(x + 8)
(2x - 9)(2x - 9) or (2x - 9)2
The GCF of 2x and 12 is 2.