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6/7-6/7×2/3×6/11
=6/7-6/7×(2/3×6/11)
=6/7-6/7×4/11
=6/7×(1-4/11)
=6/7×7/11
=6/11
=6/7-6/7×(2/3×6/11)
=6/7-6/7×4/11
=6/7×(1-4/11)
=6/7×7/11
=6/11
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