x+y=131 x=63+y
x-y=63 x=63+34
x=63+y x=97
63+y+y=131
2y=131-63
2y=68
y=68/2
y=34
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x+y=131 x=63+y
x-y=63 x=63+34
x=63+y x=97
63+y+y=131
2y=131-63
2y=68
y=68/2
y=34