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x+1=y-2
x+y=7
x-y=-3
x=7-y
x-y=-3
7-y-y=-3
-2y=-10
y=5
x+5=7
x=7-5
x=2
x+1=y-2
x+y= 7
x + 3 = y
x+y=7
x - y = -3
2x=4
x+y=7
x=2
y=7-2
x=2
y=5