Ответ:

1)0,29x+4.25x=1.589

4,54x=1,589

x=1.589:4.54

x=3.2

2)4.3x+5.8x-2.17=30.15

10.1x-2.17=30.15

10.1x=30.15+2.17

10.1x=32.32

x=3.2

3)8.43x-0.97x=11.19

-0.97x=11.19-8.43

-0.97x=2.76

x=276/97=-2.82/97

4)2.48+3.8x-5x=2

2.48-1.2x=2

-1.2x=2-1.48

-1.2x=-0.48

x=0.4