Tolong di jawab no 1-7 pakai cara bsk dikumpul

1. 5x + 8 + 8a - 3
= 5x + 8a + 5
2. 6a - 5b - 2c + (-8a) + 6b + 9c
= 6a - 5b - 2c - 8a + 6b + 9c
= -2a + b + c
3. 20p² - 15p + 21p² + 28p
= 41p² + 13p
4. 8x³ - 12x² +20x +12x³ +27x² - 24x
= 20x³ +15x² -4x
5. 2x -4 +y +3x +2 - 5y
= 5x -2 -4y