Answer:
x^4 - 3x^3 + 3x^2 - 2x + 4
Explanation:
(x^4 - 3x^3 + 3x^2 - 3x + 6) + (x - 2)
Reorder
x^4 - 3x^3 + 3x^2 - 3x+x + 6-2
Simplify
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