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2. = 8p³ - 5p³ - 6q² - 3q² - 4r = 3p³ - 9q² - 4r
3. = 7x² + 4x² - 5y² - 3y² = 11x² - 8y²
4. = -4m³ - 3m³ - 9m + 4m = -7m³ - 5m
= 8x² + 6x
2.8p³- 5p³- 6q²- 3q²- 4r
= 3p³ - 9q² - 4r
3.7x² + 4x² - 5y²- 3y²
= 11x² - 8y²
4. -9m + 4m -4n³ - 3n³
=-5m - 7n³