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