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Jack: 600*2/3
Tomi: x
600*(1/4)+600*(2/3)+x=600
--Resuelvo:
150+400+x=600
--Sumo 150+400:
550+x=600
--Paso el 550 que es positivo, pasa restando:
x=600-550
x=50
Tomi corrió 50 m