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

hard

In triangle $RST$, the measure of angle $R$ is $39^{\circ }$, the measure of angle $S$ is $x^{\circ }$, and the measure of angle $T$ is $(5x-3{)}^{\circ }$. Point $L$ lies on $RS$, point $K$ lies on $ST$, and $LK$ is parallel to $RT$. What is the measure, in degrees, of angle $SKL$? (Disregard the degree symbol when entering your answer.)

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