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Así es:
45 x+y=85
x=85-y
50y+20x=2300
5y+2x=230 x+y=85
170-2y+5y=230 x+20=85 x-y=65-20=45
170+3y=230 x=65
3y=60
y=20
Saludos !!! no te olvides de agradecerme y ponerme estrellitas por fas