Номер 2. Прошу сделайте!
1)5a-3b-8a+12b=-3a+9b 2)16c+(3c-2)-(5c+7)=16c+3c-2-5c-7=14c-9 3)7-3(6y-4)=7-18y+12=-18y+19
5а-3b-8a+12b = 5a-8a-3b+12b = -3a+9b 16c+(3c-2)-(5c+7) = 16c+3c-2-5c-7 = 16c+3c-5c-2-7=14c-9 7-3(6y-4) = 7-18y+24= 7+24-18y = 31-18y