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3 1/7+[-5/14]+[-7/12]+2 3/4
=22/7-5/14-7/12+11/4
=(44-5)/14-(7/12-11/4)
=39/14-(7-33)/12
=39/14+26/12
=39/14+13/6
=(39×3+13×7)/42
=(117+91)/42
=208/42
=104/21
=4 20/21
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