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(x² + 6x + 5) - (-2x² + 3x - 6)
= x² + 6x + 5 -(-2x²) -(3x) - (-6)
= x² + 6x + 5 + 2x² - 3x + 6
= (x² + 2x²) + (6x - 3x) + (5 + 6)
= 3x² + 3x + 11