найти ошибки и исправить их
(3- x)(x + 3) =x? - 9
(b- 5c)! =b - 5bc + 25c
(- x- 4c)? x - 8xc - 16c
(3b - a) =9b' + 6ab- a
(2c - x)(2c + x) =2c" - x
206
305
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