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(5x² + 7x + 12) + (4x² + 12x - 12)
= (5x² + 4x²) + (7x + 12x) + (12 - 12)
= 9x² + 19x
Pengurangan
(5x² - 4x²) + (7x - 12x) + (12 - (-12))
= x² - 5x + 24