4 - (2/3 + 2 ) + (2 - 2/3)
4 - (2/3 + 2 ) + (2 - 2/3) = 4 - 2/3 - 2 + 2 - 2/3 = 4 - 2_2/3 = 2 - 2/3 = 1_1/3
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4 - (2/3 + 2 ) + (2 - 2/3)
4 - (2/3 + 2 ) + (2 - 2/3) = 4 - 2/3 - 2 + 2 - 2/3 = 4 - 2_2/3 = 2 - 2/3 = 1_1/3