Triangles $JKL$ and $MNO$ are congruent. The measure of angle $J$ is $(2x{)}^{\circ }$, the measure of angle $K$ is $(3x-10{)}^{\circ }$, and the measure of angle $L$ is $(x+40{)}^{\circ }$. If vertex $J$ corresponds to vertex $M$, vertex $K$ corresponds to vertex $N$, and vertex $L$ corresponds to vertex $O$, what is the measure of angle $O$?