Answer
726
Work Step by Step
$\ \ \ \overset8/\!\!9\overset9/\!\!0\overset{10}0$
$\underline{-1\,7\,4}$
$\ \ \ 7\,2\,6$
$\ \ \ \overset17\overset126$
$\underline{+174}$
$\ \ \ 900\checkmark$
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