2 2/3 + (-1 5/6)=
-5 1/3 + 4,5 =
2 2/2+(-1 5/6)=8/3-11/6=16/6-11/6=5/6
-5 1/3+4.5=-16/3+45/10=-160/30+135/30=-25/30=-5/6
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