In the figure shown, line $m$ is parallel to line $n$. The angle adjacent to $x^{\circ }$ (forming a linear pair with $x^{\circ }$) is $A^{\circ }$. The angle vertically opposite to $y^{\circ }$ is $B^{\circ }$. If $A=2B-10$, what is the value of $x$?

Note: Figure not drawn to scale.