（1）5x-0.5=8 

               5x=8.5

                 x=1.7（2）（x- 4.6）×2.3 =9.338 

                          x-4.6=4.06

                                x=8.66

（3）3x-1.45=2x+1.45 

            3x-2x=1.45+1.45

                   x=2.9

（4）3.5x+x-14=18.4

                  4.5x=18.4+14

                  4.5x=32.4

                       x=7.2