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(-a +3)/2 + ( 1 - 3)/2 = 8
(-a + 3)/2 + ( -2)/2 = 8
( -a +3)/2 - 1 = 8
(-a + 3)/2 = 8 + 1
(-a+ 3)/2 = 9
-a + 3 = 18
-a = 18 -3
-a = 15
a = -15