$$n : \frac { 17 ( 2 - x ) - 5 ( x + 12 ) } { 1 - 7 x } = 8$$
$n=-\frac{16\left(11x+13\right)}{1-7x}$
$x\neq -\frac{13}{11}\text{ and }x\neq \frac{1}{7}$
$x=-\frac{n+208}{176-7n}$
$n\neq 0\text{ and }n\neq \frac{176}{7}$