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Solve the following Express your answer in lowest terms.
1. 7 2/3 + 12 4/5
2. 3/5 + 7/10
3. 23 6/10 + 8 2/18
4. 15/20 - 7/10
5. 16 4/12 - 12 8/12
6. 10 5/9 - 2/3