[tex] \left \{ {{x+y=80} \atop {2x-3y=35}} \right. rezulta \left \{ {{x=80-y} \atop {2(80-y)-3y=35}} \right. rezulta \left \{ {{x=80-y} \atop {160-2y-3y=35}} \right.
[/tex]
[tex] \left \{ {{x=80-y} \atop {-5y=-125}} \right. rezulta \left \{ {{x=55} \atop {y=25}} \right. [/tex]
