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= 6p - 8p - 5q + 6q - 2r + 9r
= -2p + q + 7r
2. (8x² + 4x - 21) + (6x² - 14x + 7)
= 8x² + 6x² + 4x - 14x - 21 + 7
= 14x² - 10x - 14
3. (7a + 14) - (9a + 12)
= 7a + 14 - 9a - 12
= 7a - 9a + 14 - 12
= -2a + 2
4. (2x² + 15x - 18) - ( 11x² - 17x + 24)
= 2x² + 15x - 18 - 11x² + 17x - 24
= 2x² - 11x² + 15x + 17x - 18 - 24
= -9x² + 32x - 42
5. -5(4y² - 2y + 8) - 4(7y² + 6y - 5)
= -20y² + 10y - 40 - 28y² - 24y + 20
= -20y² - 28y² + 10y - 24y - 40 + 20
= -48y² - 14y - 20
semoga membantu ya :)