Intermediate Algebra for College Students (7th Edition)

{$4$}
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, {$4$}