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Which one of the following is the simplest form of
`frac{7(2r+3)+4r-3}{2(r+1)+4r+7}`
A.`frac{6r+6}{2r+3}`

B.`frac{6r+8}{2r+3}`

C.`frac{9r}{3r+4}`

D.`2 1/2`