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(2) 2x-y =60
Despejamos "y" de (1)
y =165 -x
Despejamos "y" de (2)
-y =60-2x
y= 2x -60
Igualamos los resultados anteriores
2x -60=165-x
2x +x =165+60
3x = 225
x = 225/3
x= 75
Como ya sabiamos que y = 165-x
Reemplazamos x
y= 165 -75
y= 90