Answer
{$-1$}
Work Step by Step
Given: $4y+3=4y+5$
or, $ 3 \neq 5$
or, $4y=16 \implies y=4$
Now, $4y+3=-(4y+5)$
or, $ 4y+3=-4y-5$
or, $ 4y+4y=-5-3 \implies 8y=-8$
or, $y=-1$
Hence, {$-1$}
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