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-2x + y = 7
_________+
6y =18
y = 3
2x + 5y = 11 | x1 |
-2x + y = 7 | x5 |
2x + 5y = 11
-10x + 5y = 35
___________-
12x = -24
x = -2
(x,y) = (-2 , 3) [b]