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If k(x)=3x-9 and L(x)=7x-10 then Lok is ...

If `k(x)=3x-9` and `L(x)=7x-10` then Lok is …………..

A

`21x+73`

B

`-21x+73`

C

`21x-73`

D

`22x-73`

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