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2x+4y=38
x=12-y
2(12-y)+4y=38
x=12-y
24-2y+4y=38
x=12-y
2y=38-24
x=12-y
2y=14 |:2
x=12-y
y=7
x=12-7
y=7
x=5
y=7
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