2 2/3 + (-1 5/6)= -5 1/3 + 4,5 =
2 2/3 - 1 5/6 = 8/3 - 11/6 = (8 -11) / 6 = -3/6 = - 1/2 -5 1/3 + 4 1/2 = 16/3 + 9/2 = ( -32 + 27)/ 6 = - 5/6
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