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betty = 3.x soles(betty tiene el triple q ana)
carmen = 3.x +6 ( 6 soles más q betty)
betty + carmen + ana= 62 soles
3x + 3x +6 + x = 62
7x =56
x=8
reemplazas : carmen tiene = 3x +6 = 3(8) + 6 = 30