Answer
9585
Work Step by Step
$/\!\!1\overset{17}7\overset7/\!\!8\overset9/\!\!0\overset{11}1$
$\underline{-8\,2\,1\,6}$
$\ \ \ 9\,5\,8\,5$
$\ \ \ 9\overset15\overset185$
$\underline{+8216}$
$\ \,17801\checkmark$
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