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x-y=05 x+10=25
_____ - x=25-10
2y=20 x=15
y=10
x+y=25
x-y=5
----------- -
2y=20
y=10
eleminsai y
x+y=25
x-y=5
----------- +
2x=30
x=15
jdi, HP={15,10}