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x=6
{6+y=9
{x=6
{y=9-6
{x=6
{y=2
{x=6
2)3y=12/:3
y=4
{3x+2x4=2
{y=4
{3x=6/:3
{x=2
{x=2
{y=4
3){-2x+y=-8/x2
{4x-3y=2
{-4y+2y=-16
{4y-3y=2
-y=-14/:(-1)
y=14
{-2x+2x14=-8
{y=14
{-2x=-36/:(-2)
{y=14
{x=18
{y=14
4){x-3y=-4/x(-5)
{5x-2y=-7
{-5x+15y=20
{5x-2y=-7
13y=13/:13
y=1
{x-3=-4
{y=1
{x=-1
{y=1