please solve the 12th question.
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x+y=5
2x-3y=4
- + -
---------------
2*x+y=5
2x-3y=4
2x+2y=10
2x-3y=4
=5y=6
y=6/5
2x-3y=4
- + -
---------------
2*x+y=5
2x-3y=4
2x+2y=10
2x-3y=4
=5y=6
y=6/5
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