PLEASE I REALLY NEED THIS ANSWER ITS ON A TGA AND ITS DUE IN TWO HOURS
ILL MARK YOU AS BRAINLEST

Answer:
(a) -2/1/3+(-1/3/4)=-2/1/3-1/3/4
=-7/3-7/4
=-28/12-21/12
=-49/12
=-4/1/12
(b) -2/1/3+1/3/4=-7/3+7/4
=-28/12+21/12
=-7/12