Sagot :
Bonsoir,
a. 8-7x=57
- 7x = 57 - 8
- 7x = 49
x = - 49/7
x = - 7
b. 2x-11=7x+4
2x - 7x = 4 + 11
- 5x = 15
x = - 15/5
x = - 3.
Réponse :
A)8-7x=57
c a d -7x=57-8
c a d-7x=49
Donc x=49/-7
x=-7
B)2x-11=7x+4
c a d 2x-7x=11+4
c a d -5x=15
Donc x=15/-5
x=-3