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Math·Geometry and Trigonometry·Lines, angles, and triangles

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In triangle $PQR$, the measure of angle $P$ is $(4x+17{)}^{\circ }$, the measure of angle $Q$ is $(5x+16{)}^{\circ }$, $PQ=6$, and $QR=6$. Side $PR$ is extended through point $R$ to point $S$. The measure of angle $QRS$ is $y^{\circ }$. What is the value of $y$?

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