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{ 3x+4y=8
{ x=5+y
{ 3(5+y)+4y=8
15+3y+4y=8
15+7y=8
7y=8-15
7y=-7
y=-1
x=5+y
x=5+(-1)
x=4
{ y=-1
{ x=4
x=5+y
x=5+(-1)
x=4