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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
d=a+bc /:b
d/b=a+c
c=d/b -a
e) x=2k+1;k
2k=x-1
k=x/2-0,5
f)2k=7n+5;n
7n=2k-5 /:7
n=2/7k - 5/7