In order.
6X + 4X = 10X
10X - 2X = 8X
8X + (1)X = 9X
9X
-------final answer
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-x2 + 6x + 16 = -(x2 - 6x - 16) = -(x - 8)(x + 2) = -(8 - x)(x + 2)
6x+4 = x+12+4x-6 6x-x-4x = 12-6-4 x = 2
x2 + 6x = x*(x + 6)
5x + x - 6x + 2x = 2x
(6x + 1)(x + 2)