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5x - y=23
3x + 7y=-9
Multiplicamos la primera ecuacion por 7
35x -7y=161
3x+7y=-9
Se eliminan las y:
38x=152, despejamos x: 152/38, X=4
remplazamos x en una ecuacion
3(4)+ 7y=-9, despejamos 7y: 7y=-9-12, Y=-21/7, Y=-3