Answer
{$0$}
Work Step by Step
Given: $3x-5=3x+5$
or, $ -5 \neq 5$
Now, $3x-5=-(3x+5)$
or, $3x-5=-3x-5$
or, $3x+3x=-5+5 \implies x=0$
Hence, {$0$}
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