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Verify: (a/b+c/d)+e/f=a/b+\ (c/d+e/f)fo...

Verify: `(a/b+c/d)+e/f=a/b+\ (c/d+e/f)for\ a/b=\ (-2)/3, c/d=5/7a n d e/f=(-1)/6dot`

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