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Verified answer
3x² - x - 12 + (5x² + 8x + 1)= 3x² + 5x² - x + 8x - 12 + 1
= 8x² + 7x - 11
= 3x² + 5x² - x + 8x - 12 + 1
= 8x² + 7x - 11