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Select the write the most appropriate answer from the given alternatives in each of the following :
If the function
`{:(f(x)(sin3x)/(7x)+a",","for" x gt0),(=x+3-b",","for"xlt0):}`
is continous at `x=0,` then `a+b` is equal to

A

`2/7`

B

`7/18`

C

`18/7`

D

`-18/7.`

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