Add the following expressions.
1. (2/3a - 4/5b + 3/5c)+(-3/4a -5/2b + 2/3c) + (5/2a + 7/4b -5/6c)
2. (8/5x + 11/7y +9/4xy) + (-3/2x - 5/3y -9/5xy)
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