3 (x-4) = 5x

-5 (7-x) = 6 (x+2) =

2 (0,2x-3) - 8 (0,7x-4) = 39

0,5 (3x-4) + 4,4=0,9 (4x-2) =

1) 3 (х-4) = 5 х

3 х-12-5 х=0

-2 х=-12

х = - 12: (-2)

х = 6

2) - 5 (7-х) = 6 (х+2)

-35+5 х=6 х+12

-35+5 х-6 х-12=0

-х=-47/1

х=47

3) 2 (0.2 х-3) - 8 (0.7 х-4) = 39

0.4 х-6-5.6 х+32-39=0

-5.2 х-13=0

х=-13: (-5.2)

х = 2.5

4) 0.5 (3 х-4) + 4.4=0.9 (4 х-2)

1.5 х-2+4.4-3.6 х+1.8=0

2.1 х+4.2=0

х=4.2: 2.1

х = 2