（1）3x+8=26

             3x=18

              x=6（2）x÷3.6=4

                 x=4×3.6

                 x=14.4（3）2.8x-1.2x=5.44

                 1.6x=5.44

                      x=3.4

（4）5（x+4）=60

                    5x=40

                      x=8（5）12x-8.3x=5.92

               3.7x=5.92

                    x=1.6（6）2x+9.2÷2.3=12

                   2x+4=12

                         x=4