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x+180=2(y-180)
x-150=y+150..........x=y+150+150............x=y+300
sustituimos x=y+300 en la primera ecuacion.
x+180=2(y-180)
y+300+180=2y-360
y+480=2y-360
480+360=2y-y
840=y
pedro tenia $ 840