A)
(1/2) + (-2/3)
3/6 + (-4/6)
-1/6
B)
(-1/3) - (5/6)
(-2/6)-(5/6)
7/6
C)
1/9 - (-7/3)
1/9 -(-21/9)
22/9
D)
4/3 - (-3/4)
16/12 - (-9/12)
25/12
