2.17 + (3.2 - 0.17) = 2.17 - 0.17 + 3.2 = 2 + 3.2 = 5.2
9.49 - (1.5 + 0.99) = 9.49 - 0.99 - 1.5 = 8.5 - 1.5 = 7
13 7/9 - (2.64 + 2 7/9) = 13 7/9 - 2 7/9 - 2.64 = 11 - 2.64 = 8.36
6 7/8 - (3.14 - 2 1/8) = 6 7/8 + 2 1/8 - 3.14 = 9 - 3.14 = 5.86
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