(-2)-(+2/3)=?-2/3-(-1/6)=?(-1/2)-1/3=?
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(-2)-(+2/3)=?-2/3-(-1/6)=?(-1/2)-1/3=?(-2)-(+2/3)=?-2/3-(-1/6)=?(-1/2)-1/3=?(-2)-(+2/3)=?-2/3-(-1/6)
(-2)-(+2/3)=?-2/3-(-1/6)=?(-1/2)-1/3=?
(-2)-(+2/3)=?-2/3-(-1/6)=?(-1/2)-1/3=?
(-2)-(+2/3)=?-2/3-(-1/6)=?(-1/2)-1/3=?
(-2)-(+2/3)=-8/3;
-2/3-(-1/6)=-1/2;
(-1/2)-1/3=-5/6;
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