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Entrada 2 = t
s + t = 450
s - t = 210
-----------------
2s + 0t = 660
2s = 660
s = 660/2
s = 330
El valor de s lo reemplazo en la ecuación 1
s + t = 450
330 + t = 450
t = 450 - 330
t = 120
Primera entrada pagó = 330
Segunda entrada pagó = 120