РЕшите срочно !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! и быстро даю 20 баллов

7.(3+2x)^

5. 3a^ - 3ab + 2ab - b^ = 3a^ - b^ -ab 6. 3c^ - 6c - (c^ - 6c + 9)= 3c^ - 6c - c^ + 6c + 9 = 2с^ + 9