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a) k=7n / :7
n=k/7
b) a=k+b
k=a-b
c)z=7-y
-y=z-7 /×(-1)
y= -z +7
d) d=a+bc
d-a=bc /:b
c= d-a/b
e) x=2k +1
x-1 = 2k /:2
k= x-1/2
f) 2k= 7n + 5
2k -5 =7n /:7
n= 2k-5 / 7
zad.58
d) F=G Mm/r² /× r²
F × r²= GMm /:GM
m= F×r² /GM