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-x + y = 3
________ +
2y = 6
y = 3
x = 0
x + y = 3
- x + y = 3
--------------- (+)
2y = 6
y = 6 : 2
y = 3
x + y = 3
- x + y = 3
---------------- (-)
2x = 0
x = 0