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1 3/4 + 2 5/6 (the common denominator is 12)

= 1 (3x 3)/(4x3) + 2 (5x2)/(6x2)

= 1 9/12 + 2 10/12

= (1 + 2) + (9/12 + 10/12)

= 3 + 19/12

= 3 + 1 7/12

= 4 7/12

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