help!! Va rog am nevoie de ajutor

x=nr troli Ana
y=nr troli Maria
x+y=40
x-6=y+6 x-y=12
x+y+x-y=40+12
2x=52 x=26 troli Ana y=40-26=14 troli Maria
A=Ana
M=Maria
A+M=40
A-6=M=>A+A-6=40=>2A=34=>A=17=>M=17-6=11