Разложите на множители (2b+7)(6c-5a)-(8b-9b)(5a-6c)

(2b + 7)(6c - 5a) - (8b - 9)(5a - 6c) = (2b + 7)(6c -5a) + (8b - 9)(6c - 5a) == (6c - 5a)(2b + 7 + 8b - 9) = (6c - 5a)(10b - 2) = 2(6c - 5a)(5b - 1)