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=7/12-8/12
=-1/12
B. 3/4-(2/3-1/6)
=2/3-1/6
= 4/6-1/6
= 3/6
= 3/4-3/6
= 9/12-6/12
= 3/12 = 1/4
C.5 1/2-2 2/5
= 1/2-2/5
= 5/10-4/10
= 1/10
5-2 = 3
= 3 1/10