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= m + 18
2) 4x² + x² - 13 - 16 + 5x
= 5x² + 5x - 29
3) 4p² + 3p² - 5 q² - 6 q² + 4 pq
= 7p² - 11q² + 4pq
4) 12m³ + 2m³ - 8 + 16 + 6m² - 4m
= 14m³ + 6m² - 4m + 8
5) x² + 13x² + y² + 2y² + 8xy² - 4xy² + 13x² - 9x²y - 10x²y² + 2xy
= 14x² + 3y² + 4xy² + 13x² - 9x²y - 10x²y² + 2xy