In ΔQRS, start overline, Q, S, end overline QS ​ is extended through point S to point T, m, angle, Q, R, S, equals, left parenthesis, 3, x, plus, 20, right parenthesis, degreesm∠QRS=(3x 20) ∘ , m, angle, S, Q, R, equals, left parenthesis, x, plus, 8, right parenthesis, degreesm∠SQR=(x 8) ∘ , and m, angle, R, S, T, equals, left parenthesis, 6, x, plus, 18, right parenthesis, degreesm∠RST=(6x 18) ∘ . Find m, angle, Q, R, S, .m∠QRS