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(9x² + 3x + 3x + 1) - (9x² + 3x + 3x + 1)
(9x² + 6x + 1) - (9x² + 6x + 1)
= 9x² - 9x² + 6x - 6x + 1 - 1
= 0 + 0 + 0
= 0