1 1/3-3 2/3;7 2/5-(-1 1/5);
1 1/3 - 3 2/3 = 4/3 - 11/3 = (4-11)/3 = -7/3 = -2 1/3 7 2/5 - (-1 1/5) = 37/5 + 6/5 = (37+6)/5 = 43/5 = 8 3/5
11/3-3 2/3=4/3-11/3=(4-1)/3=-7/3=2 1/3 7 2/5-(-11/5=37/5+6/5=(37+6)/5=4 3/5=8 3/5