(2a-4) + (2a+4) = 2a - 4 + 2a + 4 = 4a
-2x - (4 - x) + 2 = -2x - 4 + x + 2 = -x - 2
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(2a-4) + (2a+4) = 2a - 4 + 2a + 4 = 4a
-2x - (4 - x) + 2 = -2x - 4 + x + 2 = -x - 2