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Find the limits in a) through c) below for the function

`f(x)=(x^(2)-6x-7)/(x-7)`

. Use

`-\infty `

and

`\infty `

when appropriate. a) Select the correct choice below and fill in any answer boxes in your choice. A. Simplify your answer.)

`x->7^(-)`

B. The limit does not exist and is neither

`-\infty `

nor

`\infty `

.