You know this is a quadrilateral, thus, you know the sum of the interior angles must be 360 degrees. Consequently, you can set up the following equality:
360 = (x-11)+(4x-2)+(x-9)+(3x-5) = 9x-27
Thus, 9x = 387
Thus, x = 43
Now, solve for theta:
theta = 3x-5 = 3(43)-5 = 124
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