December 2018 1 9 Report
Rozwiąż układ równań metodą dodawania stronami.
 \left \{ {{-3x+y=-30} \atop {3x+2y=21}} \right.
 \left \{ {{4x-7y=3} \atop {3x+14y=5}} \right.
 \left \{ {{12x-5y=-19} \atop {6x+10y=-22}} \right.
 \left \{ {{10x+21y=-9} \atop {-5x-7y=8}} \right.
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