5/7 x -14/15 + 8/5 x 5/7 - 2/3 x 12/7 + 1
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Answer: 7/21
Step-by-step explanation: 5/7 x -14/15 + 8/5 x 5/7 - 2/3 x 12/7 + 1
=-14/21+8/7-24/21+1
=-14/21+(24/21-24/21)+1
=-14/21+1
=-14/21+21/21
=7/21
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