Решить уровнения. ( с+629 )- 256=467. (834 - х ) + 195=508. 3200 : х = 6831 - 6823.

(с+629)-256=467                       (834-x)+195=508              3200:x=6831-6823
с+629=256+467                          834-x=508-195                 3200:х=8
с+629=723                                   834-x=313                         х=3200:8
с=723-629                                    x=834-313                        х=400
с=94                                              x=521