Bonjour pourriez vous m'aider a faire cette exercice svp.4e

Bonjour,

2x + 4x + 12x = 144

18x = 144

x = 144/18

x = 8

2x + 4x + (4x + 40) = 520

2x + 4x + 4x + 40 = 520

10x = 520 - 40

10x = 480

x = 480/10

x = 48

8x + 10 = 10x + 4

8x - 10x = 4 - 10

- 2x = - 6

x = 6/2

x = 3

10x - 14 = 16x - 26

10x - 16x = - 26 + 14

- 6x = - 12

x = 12/6

x = 2