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In ΔPQR, \overline{PR} PR is extended through point R to point S, \text{m}\angle QRS = (7x+8)^{\circ}m∠QRS=(7x+8) ∘ , \text{m}\angle RPQ = (x+12)^{\circ}m∠RPQ=(x+12) ∘ , and \text{m}\angle PQR = (3x+20)^{\circ}m∠PQR=(3x+20) ∘ . Find \text{m}\angle RPQ.m∠RPQ.