уравнения

5x-4+2x=7 (x-3)

7-0.2x - (21.28-1.6) = 0

1/2x-3 - (2-1/3x) = 0

6/5-0.5x-0.4+2/5x=0

1) 5 х-4+2 х=7 (х-3)

5 х-4+2 х=7 х-3

5 х+2 х-7 х=-3+4

х=1

2) 7-0.2x - (21.28-1.6) = 0

7-0.2x-21.28+1.6=0

-0.2 х=-1.6+21.28-7

-0.2 х = 12.68

х = 12.68 : ( - 0.2)

х=-63.4

3) 1/2x-3 - (2-1/3x) = 0

1/2 х-3-2+1/3 х=0

1/2 х+1/3=3+2

5/6 х=5

х=5: 5/6

х=6

4) 6/5-0.5x-0.4+2/5x=0

-0.5 х+2.5 х=-6/5+0.4

2 х=-0.8

х=-0.8 : 2

х = - 0.4