can any explain this
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3y+4x=257
4y+3x=324
Add both
7y +7x=581 (Dividing by 7)
=>x+y=83 (which is written below in the fig.)
3y+4x=257
4y+3x=324
subtract both
=>x-y=67 (which is written below in the fig.)
UNDERSTOOD??
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