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