Pls help me solve this question
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Answer:
-5/2×2/3+(-5/7)×1/3+1/3
=-5/7×2/3-5/7×1/3+1/3
=-10/21-5/21+1/3
=-10/21-5/21+1×7/3×7
=-10/21-5/21+7/21
=-10-5+7/21
=-8/21
it is the answer
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