February 2019 0 11 Report
 \left \{ {{x+y=0} \atop {-x+y=-4}} \right. \left \{ {{x+y=-5} \atop {-2x+y=1}} \right. \\ \left \{ {{3x-y=3} \atop {x-y=1}} \right. \left \{ {{x-3y=0} \atop {2x-y=5}} \right. \\ \left \{ {{x-2y=-6} \atop {x+2y=2}} \right. \left \{ {{-x+4y=4} \atop {x+2y=-4}} \right.

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