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

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In triangle $RST$, the measure of angle $R$ is $50^{\circ }$, the measure of angle $S$ is $x^{\circ }$, and the measure of angle $T$ is $(4x-5{)}^{\circ }$. Point $L$ lies on $\overline{RS}$, point $K$ lies on $\overline{ST}$, and $\overline{LK}$ is parallel to $\overline{RT}$. What is the measure, in degrees, of angle $SKL$? (Disregard the degree symbol when entering your answer.)

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