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2x-2y= 8 |x2
3x+4y=17
4x-4y=16
-
-1x= 1
x= -1
2x-2y=8
2(-1) - 2y = 8
-2 -2y = 8
-2y = 8 + 2
-2y = 10
y= 10/-2 --> -5