Answer
{$4$}
Work Step by Step
Given: $2y-6=10-2y$
or, $ 2y+2y=10+6$
or, $4y=16 \implies y=4$
Now, $2y-6=-(10-2y)$
or, $ 2y-6=-10+2y$
or, $-6 \neq -10$
Hence, {$4$}
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