$$\frac { e + 5 } { A } = 12$$
$A=\frac{e+5}{12}\approx 0.643190152$
$$e+5=12A$$
$$12A=e+5$$
$$\frac{12A}{12}=\frac{e+5}{12}$$
$$A=\frac{e+5}{12}$$
$$A=\frac{e+5}{12}\text{, }A\neq 0$$
Show Solution
Hide Solution