[20/13{7/5-(16/11÷15/2×5/4+3/2)}]
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20/13+{7/5-(16/11÷15/2× 5/4+3/2)}
= 20/13+{7/5-(16/11÷15/2×2)}
= 20/13+{7/5-(16/11×2/15×2)}
=20/13+{7/5-(16/165)}
=20/13+{7/5-16/165}
=20/13+{231-16/165}
=20/13+{215/165}
=20/13+{43/33}
=660+559/429
= 1219/429
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