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a=k(x+y) / :(x+y )
a:(x+y)=k
k=a;(x+y)
b) b= 2k -ak
b=k(2-a) /:(2-a)
b:(2+a)=k
k=b:(2-a)
c) c=(k+1)b+2k
c=kb+b+2k /-b
c-b=kb+2k
c-b=k(b+2) / :(b+2)
c-b:(b+2)=k
k=c-b:(b+2)
d) d=k/k-1
e) e=k-1/k+1
F) f=k+1/k +a
g) g+2-1/k
h) h=ka2 + 1/k
h) h=ka2+k
i) i+a/2 + 2/k