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1. 2 + (4 + 7) = (2 + 4) + .... = .... 2. 6 + (3 + 8) = (6 + 3) + ... = .... 3. 10 + (1 + 9) = (10 + 1) + ..... = ... 4. -3 + (2 + (-4)) = (-3 + 2) + ... = ...
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