9y-3y=666                                                                                                                       6y=666                                                                                                                           у=666:6                                                                                                                          у=156                                                                                                                                                                                                                                                                          3х+5х=1632                                                                                                                    8х=1632                                                                                                                          х=1632:8                                                                                                                         х=204