For the following function find $($a$)f(3),($b$)f(-\frac{1}{2}),($c$)f(a),($d$)f(\frac{2}{(m)}),$ and $(e)$ any values of x such that $f(x)=1.$

$f(x)=\{\begin{array}{ccc}\frac{2x4}{x-3}& if& x3\\ 7& if& x=3\end{array}$

$($a$)$ Find the value of f$(3).$

$f(3)=$

$$

$($Type an integer or a simplified fraction.$)$

$($b$)$ Find the value of $f(-\frac{1}{2}).$

$t(-\frac{1}{2})=$

$($Type an integer or a simplified fraction.$)$

$($c$)$ Find the value of $f(a).$

$f(a)=\{\begin{array}{ccc}& if& a3\\ & if& a=3\end{array}$

$($d$)$ Find the value of $f(\frac{2}{m}).$

$$ if $m\frac{2}{3}$