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