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1/4 + 4/12 + x = 1
7/12 + x = 1
x = 1 - 7/12
x = 5/12
1/4 = 3/12 luego 3/12 + 4/12 = 7/12 así 1 = 12/12 - 7/12 = 5/12
R/ Quedo 5/12 de pastel