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(~(8-x))-(~(x^(2)-4))
Reorder the polynomial 8-x alphabetically from left to right, starting with the highest order term.
(~(-x+8))-(~(x^(2)-4))
Multiply -1 by the ~(x^(2)-4) inside the parentheses.
~(-x+8)-~(x^(2)-4)
