1                                                   ECUACIONES EN  Z

               


2X+9=18-9                                                                     
2X+9-9=18-9                                                                
2X=9                                                                             




                                                              
                                                 
                                                                          


                                                                    
                                                    
                                                                           

                                                                                         


                                                                                         
                                                                  
                                                 




                                                                
                                           
                                                                         

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