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2/3 * (3/2-3/4) + (7/4+1/2) : 4/3 =
2/3 * (6/4-3/4) + (7/4+2/4) : 4/3 =
2/3 * 3/4 + 5/4 * 3/4 = (skracamy 3 i 2 i 4 przez 2)
1/2 + 15/16 = 8/16+15/16 = 23/16 = 1 i 7/16