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x = 2
(2 - a).2² + (3 + a).2 - 8 = 0
(2 - a)4 + (3 + a)2 - 8 = 0
8 - 4a + 6 + 2a - 8 = 0
-2a + 6 = 0
6 = 2a
3 = a