Find the values of the variables in the parallelogram.

Since $\angle S$ and $\angle U$ are adjacent in parallelogram SURE,

Since $\angle U$ and $\angle E$ are opposite angles, $\angle E\cong \angle U.$ Hence,

Moreover, $\angle S$ and $\angle R$ are opposite angles. Therefore, $\angle R\cong \angle S.$ It follows that

Thus, $x={115}^{\circ },y={86}^{\circ },$ and $z={70}^{\circ }.$