-2x+6y=4
5x+y=6

2r+3s=-12
-6r-2s=7

a+b= -4
-3a-2b=14

-x-6y= -23
-2x+5y=5

-3x-y= -11
4x-3y=6

-3x+5y=7
8x+2y= -6

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