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c=kb+b+2k
c-b=kb+2k
c-b=k(b+2)
(c-b)/(b+2)=k
b) b=2k-ak
b=k(2-a)
k=b/(2-a)
c) a=xk+yk
a=k(x+y)
k= a/(x+y)
c=(k+1)b+2k
c=kb+b+2k
c-b=kb+2k
c-b=(b+2)k
k=(c-b)/(b+2)
b)
b=2k-ak
b=(2-a)k
k=b/(2-a)
c)
a=xk+yk
a=(x+y)k
k=a/(x+y)