7/4 + 2/3
= 21/12 + 8/12
= 29/12
5/3-76/27 = 45/27 - 76/27 = - 31/27
7/6-(-1/2+1/3)= 7/6-(-3/6 + 2/6)
= 7/6 - (-1/6)= 8/6 = 4/3
-7/4 + 1/9 : 4 = -7/4 + 1/9 x 1/4
= -7/4 + 1/9x4 = -7/4 + 1/36
= -63/36 + 1/36
= -62/36
= -31/18
7/5-4/5 x 1/3
= 7/5 - 4x1/5x3
= 7/5 - 4/15
= 21/15 - 4/15
= 17/15