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X - 2Y = 2
2X - 5Y = ?
X - 3Y = 1
X - 2Y = 2 +
2X - 5Y = 3
X-2y=2
---------- -
y=1
X-3y=1
X-3.1=1
X-3=1
X=1+3
X=4
2x-5y=?
2.4-5.1=3