Answer:
Angle TRS is equal to 180 - 9x (straight angles).
The sum of all the interior angles of a triangle is 180. Thus,
180 - 9x + 5x + 9 + x = 180, resulting in -9x + 5x + 9 + x = 0.
Then -4x + x = -9, or -3x = -9, or x = 3 (answer)
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