$$\left. \begin{array} { l } { 480 - ( n - 345 ) = 255 } \end{array} \right.$$
$n=570$
$$480-n-\left(-345\right)=255$$
$$480-n+345=255$$
$$825-n=255$$
$$-n=255-825$$
$$-n=-570$$
$$n=570$$
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