Bonsoir,

1)

7x-2x = 42 -2

5x= 40

x= 40/5

x= 8

2)

11x-5x = 15+3

6x = 18

x= 18/6

x= 3

3)

7x-2x = -6 -1

5x = -7

x= -7/5

x = -1,4

4)

5x-3x = 7+4

2x = 11

x= 11/2

x= 5,5

5)

6x+2x = 6-1

8x = 5

x= 5/8

x=0,625

6)

-7-1 = -3x +5x

-8 = 2x

x= -8/2

x= -4

7)

14x -35= -3x -3

14x+ 3x = -3+35

17x = 32

x= 32/17

8)

-9x +4 = 2 -6x

4-2 = -6x +9x

2 = 3x

x= 2/3