Réponse:
3y-2 = 5y -----> y = -1 ----------> 3*(-1)-2 = 5*(-1) <=> -5 = -5
y² = 6y ---------> y = 6 ----------> 6² = 6*6 <=> 36 = 36
2y = y/5+9 ----> y = 5 ----------> 2*5 = 5/5+9 <=> 10 = 10
4(y+1) = y-2 ---> y = -2 ---------> 4(-2+1) = -2-2 <=> -4 = -4
