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7-3 1/3-2 1/8=
3 3/4-2 2/3 + 6-3 5/6=
10- (2 1/9-1/2+1 5/6)=
(4 1/3-2 2/5)-(6 3/5-5 2/3)=
3 1/4+2 2/5-(4 1/3-2 2/3)
4 1/3-2 2/5+1 1/5=