8) 7t³ − 2 + (3t³ – 4t) - 2t + (7 - 5k³) = 7t³ − 2 + 3t³ – 4t - 2t + 7 - 5k³ = 10t³ - 6t + 5 - 5k³
Ответ: 10t³ - 6t + 5 - 5k³