In triangle , by angle sum theorem, .

      (Write the equation)

                (Substitute )

                     (Add.)

                                   (Subtract each side by 129)

Use Law of sines to find x.

Write the proportion using Law of sines. .

                           (Write the proportion)

                    (Substitute )

         (Apply cross product property)

                    (Divide each side by )

                                         (Use a calculater)

The measure of x is about 13.