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{x+2y=-7
{2x-2y=8
{x+2y=-7
2x=1|:2
x=
x-y=4
x+2y=-7 /razy -1
x-y=-1
-x-2y=7
-3y=7 /podzilić -3
y=2⅓
x-2⅓=4
x=4+2⅓
x=6⅓