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x + 2 = 6
x = 6-2
x= 4
(x - 2 + 6)(x - 2 - 6) = 0
(x + 4)(x - 8) = 0
*x + 4 = 0
x = -4
*x - 8 = 0
x = 8
HP = { -4, 8}