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