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2X-5Y=9
X-3Y=5 |×2| 2X-6Y=10
2X-5Y=9 |×1 | 2X-5Y=9 -
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Y=-1
2X-5Y=9
2X-5(-1)=9
2X+5=9
2X=9-5
2X=4
X=2
3X+2Y=?
=3×2+2×-1
=6+(-2)
=4