Suppose $\displaystyle {A}$ is a $\displaystyle {n}\times{n}$ coefficient matrix. Find the determinants of a matrix that perform the indicated row operations.

	$\displaystyle {R}_{{{1}}}\leftrightarrow{R}_{{{2}}}$
$\displaystyle {A}$	———›	$\displaystyle {R}{A}$

$\displaystyle {\det{{R}}}=$

	$\displaystyle -{7}{R}_{{{1}}}\rightarrow{R}_{{{1}}}$
$\displaystyle {A}$	———›	$\displaystyle {S}{A}$

$\displaystyle {\det{{S}}}=$

	$\displaystyle -{7}{R}_{{{1}}}+{R}_{{{2}}}\to{R}_{{{2}}}$
$\displaystyle {A}$	————————›	$\displaystyle {T}{A}$

$\displaystyle {\det{{T}}}=$