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$11.$

$[4/9$ Points$]$

Find the limit $L.$

$L=,\underset{x-5}{lim}(2x7)$

Use the $-$ definition to prove that the limit is $L.$

Given $>0$

Let $=\frac{}{2}$

$|xy|<mfrac><mrow><mi></mi></mrow><mrow><mn>2</mn></mrow></mfrac>$

$|2xy|<mi></mi>$

$|(2x7)-()|<mi></mi>$

when $=\frac{}{2},$ you have

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