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y: pantalones
8x+5y=3080 (1)
2x+2y=1040 (2)
Despejar x en (2)
x=520-y
Remplazar en (1)
8(520-y)+5y=3080
4160-8y+5y=3080
-3y=-1080
y=360
Remplazar y en x
x=520-360 = 160
Una camisa vale 160 y un pantalon 360