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# boletos de adulto = 223 - x
PLANTEO DE LA ECUACIÓN
50x + 80(223 - x) = 13880
50x + 17840 - 80x = 13880
50x - 80x = 13880 - 17840
-30x = -3960
x= -3960/-30
x= 132
# boletos de niño = x = 132
# boletos de adulto = 223 - x = 223 - 132 = 91