From the diagram the angles are .

In a triangle sum of angles are .

                     (Add: )

  (Subtract 42 from each side)

             (Apply addiitve inverse propetry: )

                     (Apply addiitve identity propetry: )

                                (Subtract: )

                           (Divide each side by 3)

                                (Cancel common terms)

                                    (Divide: )

So,.

,  , 

So, the angle measures are  .

The value of x is . The angle measures are  .

is an obtuse angle. So, the triangle is an obtuse triangle.