Answer
{$\dfrac{9}{2}$}
Work Step by Step
Given: $x-3=6-x$
or, $ 2x-3=6$
or, $2x=6+3 \implies x=\dfrac{9}{2}$
Now, $x-3=-(6-x)$
or, $x-3=-6+x$
or, $-3 \neq -6$
Hence, {$\dfrac{9}{2}$}
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