Réponse :
Explications étape par étape
Bonsoir
1) 5y + 1,5 = 2y + 6\\
5y - 2y = 6 - 1,5
3y = 4,5
y = 4,5/3
y = 1,5
2) 5 - 2x = 11-5x\\
5x - 2x = 11 - 5
3x = 6
x = 6/3
x = 2
3)3 (2x+1) = x+11\\
6x + 3 = x + 11
6x - x = 11 - 3
5x = 8
x = 8/5
x = 1,6
4) \frac{x}{4} =\frac{7}{5}
x/4 = 7/5
x = 7 * 4/5
x = 28/5
x = 5,6