2(x + 4), 2x + 8, 2(x - 4), 2x - 8, -2(x + 3), -2x - 6, -2(x - 3), -2x + 6, 2x(x - 3), 2x2 - 6x, 2x( x + 3), 2x2 + 6x, -2x(2x - 3), -4x2 + 6x, -2x(-2x - 3), 4x2 + 6x, -2x(-2x + 3), 4x2 - 6x, -2(-x - 3), 2x + 6.

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