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n=k/7
b)a=k+6 /-6
k=a-6
c)z=7-y /+y
y+z=7 /-z
y=7-z
d)d=a+bc /-a
d-a=bc /:b
c=(d-a)/b
n= k/7
b) a=k+6
-k=-a+6 /:(-1)
k=a-6
c) y= 7-z
d) d=a+bc
bc=a-d
c(b)=a-d/(-b)
c=ab+bd
7n = k /: 7
n = k/7
b) a=k+6 ;k
k + 6 = a
k = a - 6
c) z=7-y ;y
7 - y = z
-y = z - 7 /: (-1)
y = -z + 7
d) d=a+bc ;c
a + bc = d
bc = d - a /: b
c = (d - a) : b