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7/28 X + 4/28 X = 11
11/28 X = 11
X = 11 : 11/28 = (11 . 28) / 11 = 28
Si X = 28
3 . 1/2 de 28 = 3 . 1/2 . 28 = (3 . 1 . 28) / 2 = 84 / 2 = 42