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b)a=k+6 ;; k
c)z=7-y ;;y
d)d=a+bc ;;c
e)x=2k+1 ;;k
f)2k=7n+5 ;;n
a)k=7n |:7
k/7=n
b)a=k+6 |-6
6-a=k
c)z=7-y |-7
z-7=-y
d)d=a+bc |-a
a-d=bc |:d
(a-d):d=c
e)x=2k+1 |-1
1-x=2k |:2
(1-x):2=k
f)2k=7n+5 |-5
2k-5=7n |:7
(2k-5):7=n