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y+2-3+x=0
y+x=3-2
x+y=1
x-2=5-(2-y)
x-2=5-2+y
x+2y-y=5+2
x+y=7
{x-2=5-(2-y)
{y+2-3+x=0
{x-2=5-2+y
{y+x=0-2+3
{-y+x=5-2+2
{y+x=1
{-y+x=5
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2x=6/:2
x=3
y+3=1
y=1-3
y=-2