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Function Continuity Determination

Let \[f(n) = \begin{cases} 4n+3 &\text{if }n<a, \\ 7n-12 &\text{if }n\ge{a}.\end{cases} \]Find $ a $ if the graph of $ y=f(n) $ is continuous.

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$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$