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.........................42+12+28........82.........41
2/4+1/7+1/3=-----------------= --------= -------
..............................84.................84........42
primero hallamos el m.c.d de los denominadores
4..7..3..l 2
2..7..3..l 2
1...7..3..l 3
....7...1...l 7
....1......
2x2x3x7=84