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MARCO: X + 4
LUIS: X
HERNAN: X + 8
DATO: X + 4 - 12 + X - 12 = X + 8 + 10
2X - 20 = X + 18
X = 38
LUEGO:
MARCO: X + 4 = 38 + 4 = 42
LUIS: X = 38
HERNÁN: X + 8 = 38 + 8 = 46
HACE DOS AÑOS LOS SEÑORES TENDRÁN:
MARCO: 42 - 2 = 40
LUIS: 38 - 2 = 36
HERNÁN: 46 - 2 = 44
ESO ES TODO, SALUDOS..............