Bonjour,
2x + 4 = 20
2x= 20 -4
2x= 16
x= 16/2 = 8
25 – 5x = 10 + 20x
25-10 = 20x +5x
15 = 25x
x= 15/25 = 3/5
-2x = 7 - 30x
-2x+30x = 7
28x = 7
x= 7/28 = 1/4
3x - 8 + 5x - 4x = 12x - 4
-8 +4 = 12x -3x -5x +4x
-4 = 8x
x= -4/8 = -1/2
on peut m'aider c un exo il me reste que 20 minute svp ?
