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x+5y=8 /*(-2)
2x-y=5
-2x-10y=-16
2x-y=5
-10y-y=-16+5
-11y=-11 /:(-11)
y=1
y=1
2x-y=5
y=1
2x-1=5
y=1
2x=5+1
y=1
2x=6 /:2
y=1
x=3