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

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In the figure shown, point $T$ lies on segment $SW$, and segment $TU$ is parallel to segment $VW$. The measure of angle $V$ is $26^{\circ }$, and the measure of angle $STU$ is $74^{\circ }$. What is the value of $p-r$?

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