Answer:

 Ð1 = 110, Ð2 = 70

 Ð1 + Ð2 = 180

 2x + 12 + 4x - 6 = 180                            Ð1 =  4x - 6                       Ð2 = 180 - 110

                6x + 6 = 180                            Ð1 =  4(29) - 6                   Ð2  = 70°            

                6x = 174                                   Ð1 = 116 - 6

                  x = 29                                     Ð1 = 110°