21.60 cuesta cada pantalón
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x = pantalones
y = camisas
15x + 7y = 415 ------------ (1)
x = y + 13 ------------ (2)
Por reducción de terminos semejantes: (2) x 7
15x + 7y = 415
7x - 7y = 91
22x = 506
x = 23
21.60 cuesta cada pantalón