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y ⇒ Billetes de $10
x+y=12 /*(-10)
5x+10y=105
(Es un sistema de ecuaciones)
-10x-10y=-120
5x+10y=105
-5x=-15
x=3
3+y=12
y=9
Para comprar el DVD he usado 3 billetes de $5 y 9 billetes de $10.