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= 24t³ - 5t² + 14t
b) 13m² .n + 9m.n² + 8 + 2m².n = 15m².n + 9m.n² + 8
c) 4a + b + 11 - 2b - 16a + 21c = (4a - 16a) + (b - 2b) + 21c + 11
= - 12a - b + 21c + 11