x+y=13 x-y=1
x=-y+13 (-y+13)-y=1
x=-(6) +13 -y+13-y=1
x=7 -2y=1-13
y=-12/-2
y=6
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x+y=13 x-y=1
x=-y+13 (-y+13)-y=1
x=-(6) +13 -y+13-y=1
x=7 -2y=1-13
y=-12/-2
y=6