Нужна помощь завтра сдавать))

Пусть х - кол-во маленьких коробок, а у - больших. $\left \{ {{y+x=13} \atop {5x+8y=83}} \right. \left \{ {{y=13-x} \atop {5x+8(13-x)=83}} \right. \left \{ {{y=13-x} \atop {5x+104-8x=2}} \right. \left \{ {{y=13-x} \atop {104-3x=83}} \right. \left \{ {{y=13-x} \atop {3x=104-83}} \right.[tex] \left \{ {{y+x=13} \atop {5x+8y=83}} \right. \left \{ {{y=13-x} \atop {5x+8(13-x)=83}} \right. \left \{ {{y=13-x} \atop {5x+104-8x=2}} \right. \left \{ {{y=13-x} \atop {104-3x=83}} \right. \left \{ {{y=13-x} \atop {3x=104-83}} \right.$ $\left \{ {{y+x=13} \atop {5x+8y=83}} \right. \left \{ {{y=13-x} \atop {5x+8(13-x)=83}} \right. \left \{ {{y=13-x} \atop {5x+104-8x=2}} \right. \left \{ {{y=13-x} \atop {104-3x=83}} \right. \left \{ {{y=13-x} \atop {3x=104-83}} \right. \left \{ {{y=6} \atop {x=7}} \right.$