-5 7\9+ (-3 4\9)=? -5\8+(-11\12)=? -4 5\14 + (-7 9\21) =?
-5 7\9+ (-3 4\9)= -5 7\9-3 4\9= -8 11/9= -9 2/9 -5\8+(-11\12)= -5\8-11\12= -15/24-22/24= -37/24= -1 13/24 -4 5\14 + (-7 9\21) = -4 5\14 -7 9\21 = -11 33/42