:a) (6 целых 3/14-x)* 2целых 1/3= 9целых 5/6 b) 7/8: (3/4x-5/16)=7/8 c) (5/12 - 1/2x): 1/2=2/3

6 3/14-x=9 5/6:2 1/3=59/6*3/7
6 3/14-x=59/14
x=6 3/14-4 3/14
x=2

3/4x-5/16=7/8:7/8
3/4x-5/16=1
3/4x=1+5/16
3/4x=1 5/16
x=1 5/16:3/4=21/16*4/3
x=7/4=1,75

5/12-1/2x=2/3*1/2
5/12-1/2x=1/3
1/2x=5/12-1/3=5/12-4/12
1/2x=1/12
x=1/12:1/2=1/12*2/1
x=1/6