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12x³ - 9x² - 8 - 15x³ + 7x² + 5
12x³ - 15x³ - 9x² + 7x² - 8 + 5
- 3x³ - 2x² - 3
2.
-3(4k² + 3k²) + 2( -9k² - 4k²)
-3 ( 7k²) + 2( -13k²)
-21 k² - 26 k²
-47 k²
3.
5 ( 3m³ - 5m² + m) - 2( m³ + 4m² - 9m²)
15 m³ - 25 m² + 5 - 2m³ - 8 m² + 18 m²
15 m³ - 2m³ - 25 m² - 8 m² + 18 m² + 5
13 m³- 15 m² + 5