Angles TRS and TRV are supplementary, that is,
m∠TRS + m∠TRV = 180°
(25x + 30) + (5x) = 180
(25x + 5x) + 30 = 180
30x = 180 - 30
x = 150/30
x = 5
Angles TRV and WRS are vertical angles, then they are congruent, that is,
m∠TRV = m∠WRS
5x = m∠WRS
5*5 = m∠WRS
25° = m∠WRS