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5x- 2y=12 |×5|
6x+10y=2
25x-10y=60
------------(+)
31x=62
x=2
3x+5y=1
3.2+5y=1
5y=1-6
y=-5/5
y=-1
2x-3y=2.2-3.(-1)
=4+3
=7