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b. 6x - 5y - 2z - 8x + 6y + 9z = -2x + y + 7z
c. 3 (2x² - 4x + 5) + 2 (4x² + 3x - 7) = 6x² - 12x + 15 + 8x² + 6x - 14
= 14x² - 6x + 1
maaf kalo salah