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(2-a)(2)² + (3+a)(2) - 8 = 0
8 - 4a + 6 + 2a - 8 = 0
-2a + 6 = 0
-2a = -6
a = -6/-2 = 3
8-4a+6+2a-8=0
-2a=-6
a=3