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z = s + 85 (zapatos cuestan 85 más que el sueter)
sueter = x
Zapato + sueter = 665
x+85 + x = 665
2x = 665 - 85
2x = 580
x = 580/2
x = 290 = sueter
zapato = x + 85
zapato = 290 + 85
zapato = 375