Verified answer

Bonsoir,

7x + 17 = 9x + 29

17 - 29 = 9x - 7x

-12 = 2x

x = -12/2

• x = -6

4x + 15 = 7x + 24

15 - 24 = 7x - 4x

-9 = 3x

x = -9/3

• x = -3

8x + 26 = 5x + 14

8x - 5x = 14 - 26

3x = -12

x = -12/3

• x = -4

23x + 31 = 16x + 17

23x - 16x = 17 - 31

7x = -14

x = -14/7

• x = -2

Exercice 7 :

-2x + 7 = -x + 9

7 - 9 = -x + 2x

• x = -2

4x - 21 = 7x - 9

-21 + 9 = 7x - 4x

-12 = 3x

x = -12/3

• x = -4

-7x - 12 = 8x + 3

-12 - 3 = 8x + 7x

-15 = 15x

x = -15/15

• x = -1

7x + 13 = -3x - 7

7x + 3x = -13 - 7

10x = -20

x = -20/10

• x = -2