x-roșiile
y-ceapa
z-cartofii
x+y+z=106kg
x=y+28
z=x+y+14 (x=y+28)=>z=(y+28)+y+14
Înlocuim: (y+28)+y+(y+28)+14+y=106
Desfacem parantezele: y+28+y+y+28+14+y=106
4y+28+28+14=106
4y+70=106
4y=106-70
4y=36
y=36:4=9
x=9+28=37
y=9
z=9+37+14=60
Proba: x+y+z=106=>37+9+60=106kg