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

hard

In triangle RST, the measure of angle R is $49^{\circ }$, the measure of angle S is $x^{\circ }$, and the measure of angle T is $(7x-5{)}^{\circ }$. Point L lies on RS, point K lies on ST, and LK is parallel to RT. What is the measure, in degrees, of angle SKL?

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