bonjour
Numéro 39
3 x + 20 = 7
3 x = 7 - 20
3 x = - 13
x = - 13/3
2 (L + 5 ) = 3
2 L + 10 = 3
2 L = 3 - 10
2 L = - 7
L = - 7 /2
2 - 4 y = 1
- 4 y = 1 - 2
- 4 y = - 1
y = 1 /4
numéro 40
3 - 5 x = 2
- 5 x = 2 - 3
- 5 x = - 1
x = 1 /5
( t - 5 ) / 3 = 7
( t - 5 ) /3 = 21 /3
t - 5 = 21
t = 21 + 5
t = 26
m /2 - 3 = 6
m/2 = 12/2 + 6/2
m = 12 + 6
m = 18
bonne journée
