Tìm x : a/ 7/2 . ( x - 1 ) + 4/3 = 5/7 b/ 1/2 . ( x - 1/3 ) + 1/2 . (x + 2/3 ) = 1/4 c/ 4/3 . ( x - 1/2 ) = 1/2 . ( x + 1/3 ) d/ 3/4 . ( x + 1/2 ) -1/3 = 1/2 x

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