Answer
68.665
Work Step by Step
Align decimals to subtract.
$\ \ \ \overset7/\!\!\!8\overset{16}6.\overset6/\!\!\!7\overset9/\!\!\!0\overset{10}0$
$\underline{-1\,8.\ 035}$
$\ \ \ 6\,8.\ 665$
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