in ΔQRS, \overline{QS}
QS
​
is extended through point S to point T, \text{m}\angle QRS = (x+8)^{\circ}m∠QRS=(x+8)
∘
, \text{m}\angle RST = (4x+11)^{\circ}m∠RST=(4x+11)
∘
, and \text{m}\angle SQR = (x+13)^{\circ}m∠SQR=(x+13)
∘
. Find \text{m}\angle RST.m∠RST.