Long description
Step 1. 16 left parenthesis 8 minus x right parenthesis minus 2 left parenthesis 8 x minus x squared right parenthesis minus left parenthesis 64 minus 16 x plus x squared right parenthesis. Step 2. Negative sign before the 64, 16 x and positive sign before the x squared is retained in the second step, 128 minus 16 x minus 16 x plus 2 x squared minus 64 plus 16 x minus x squared. Step 3. 64 minus 16 x plus x squared.
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