Points $$\(R\)$$ and $$\(S\)$$ lie on a circle with diameter $$\(P Q\)$$. $$\(R Q\)$$ is parallel to $$\(P S\)$$. Angle $$\(R P Q=58^{\circ}\)$$. Find the value of $$\(x\)$$, giving a geometrical reason for each stage of your working. ................................................................................................................................................. . ................................................................................................................................................. . ................................................................................................................................................. . $$\[ x=............................................ \]$$

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