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Answer:
x³ + 2x² - 3x + 6
Step-by-step explanation:
(4x³ + 2x² - x + 1) - (3x³ + 2x - 5) =
= 4x³ + 2x² - x + 1 - 3x³ - 2x + 5
= x³ + 2x² - 3x + 6