4x-55=2x+105 3x - (9x-70) = 5 (4-x)

2 (x+3) = 4x-20 1/4x = - 10

4x - (7x-35) = 17

5x - (7x-35) = 6

1) 4 х-55=2 х+105

4 х-2 х=105+55

2 х=160

х=80

2) 3 х-9 х+70=20-5 х

3 х-9 х+5 х=20-70

-х=-50

х=50

3) 2 х+6=4 х-20

2 х-4 х=-20-6

-2 х=-26

2 х=26

х=13

4) 1/4 х=-10

х=-40

5) 4 х-7 х+35=17

-3 х=17-35

-3 х=-18

х=6

6) 5 х-7 х+35=6

-2 х=6-35

-2 х=-29

х=14.5