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2)b=2k-ak b+ak=2k /:k b+a=k
3)c=(k+1)b+2k c=kb+b+2k c-kb-b=2k c-k=2k -k=2k-c/:(-1) k=2k-c
4)f=k+1/k +a/*k fk=k+1+ak /:f k=k+1+ak/f
5)i=a/2+2/k /*k ik=a/2+2 /:i k=a/2+2 /i
6)h=ka^2+k h-k=ka^2 /:h -k=ka^2/h /*(-1) k=-ka^2/h
7)g=2-1/k /*k gk=2-1 /:g k=2-1/g=1/g