4 3/7-(1 4/7-5,5)=8 5/14
1 4/7-5,5=11/7-55/10=110-385/70=
-275/70=-3 13/14
4 3/7-(-3 13/14)=7+(3/7+13/14)=
7+(6+13/14)=7+19/14=8 5/14
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4 3/7-(1 4/7-5,5)=8 5/14
1 4/7-5,5=11/7-55/10=110-385/70=
-275/70=-3 13/14
4 3/7-(-3 13/14)=7+(3/7+13/14)=
7+(6+13/14)=7+19/14=8 5/14