- c - 5,7=-(-5 1/6)-5,7=5 1/6 - 5 7/10=
=31/6-57/10=(31*5-57*3)/30=(155-171)/30=
=-16/30=-8/15
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- c - 5,7=-(-5 1/6)-5,7=5 1/6 - 5 7/10=
=31/6-57/10=(31*5-57*3)/30=(155-171)/30=
=-16/30=-8/15