Réponse :
Explications étape par étape
Bonsoir
3y - 2 = 5y
5y - 3y = -2
2y = -2
y = -2/2
y = -1
y^2 = 6y
y^2 - 6y = 0
y(y - 6) = 0
y = 0 ou y - 6 = 0
y = 0 ou y = 6
2y = y/5 + 9
2y - y/5 = 9
10y/5 - y/5 = 9
9y/5 = 9
y = 9 * 5/9
y = 5
4(y + 1) = y - 2
4y + 4 = y - 2
4y - y = -4 - 2
3y = -6
y = -6/3
y = -2
