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x+y = 122
2x + 17 = 122
resuelvo la segunda porque tiene 1 incognita sola
2x + 17 = 122
2x = 105
x = 52,5€
y entonces sustituimos x en la primera
x+y = 122
52,5 + y = 122
y = 122 - 52,5
y = 69,5€
SUERTE!!!