（1）88.6÷x= 14                                  

                  x=6.33

（2）5.8 × 4.5 +0.4x=29.1

                           0.4x=3

                               x=7.5

（3）2.8x-1.6=46  

              x=17

（4）5.3x-x=86

            4.3x=86

                 x=20

（5）5（x+4.4） =61  

                         x=7.8

（6） x+ 0.7x+0.96=3

                       1.7x=2.04

                           x=1.2