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b) a=k+6 , k
k = a - 6
c) z=7-y , y
-y = z - 7
y = 7 - z
d) d=a+bc ,c
bc = d- a
e) x=2k+1 ,k
2k = x- 1
f) 2k=7n+5 , n
7n = 2k - 5