Answer
{$4$}
Work Step by Step
Given: $x-3=5-x$
or, $ 2x-3=5$
or, $2x=5+3 \implies x=4$
Now, $x-3=-(5-x)$
or, $x-3=-5+x$
or, $-3 \neq -5$
Hence, {$4$}
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