Let's simplify each expression step by step:

1) (5m³ - 4m² + 3m + 2) + (4m² - 6 - 5m³ - 8)
Rearrange the terms:
= 5m³ - 5m³ - 4m² + 4m² + 3m - 6 + 2 - 8
= 3m - 12

2) 11(2x² - 3x - 7) - (11 - 5x - 5x²) + (8 + 3x - 7x²)
Distribute the 11:
= 22x² - 33x - 77 - 11 + 5x + 5x² + 8 + 3x - 7x²
Combining like terms:
= 27x² - 25x - 80

Putting both simplified expressions together:
3m - 12 = 27x² - 25x - 80

Therefore, the simplified expression is:
3m - 12 = 27x² - 25x - 80