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camisas : b
pantalones: c
b + c = 5
a + c = 7
a + b = 4
2a + 2b + 2c = 5 + 7 + 4
2(a + b + c) = 16
a + b + c = 8
b + (a+c) = 8
b + 7 = 8
b= 1
Rpta: 1 camisa