How can i find x? click for picture.

  You add up all the terms given of EACH angle, and make this an addition problem that is "equal to 180" ; since all triangles have three angles that add up to 180 degrees.  Then you solve for "x".

(as follows) ;  to get:    " x = 29 ⅔ ° " .


         3x + 4 + 2x + x + 8 = 180  ;

Combine the "like terms" ;

         3x + 2x + x = 6x ;

                 4 + 8 = 12

So, we have:  6x + 12 = 180 ;

Now, subtract "12" from each side of the equation:

  6x + 12 − 12 = 180 − 12 ;

 to get: 

      6x = 178 ;

Now, divide EACH SIDE of the equation by "6" ; to isolate "x" on one side of the equation; and to solve for "x" ;

    6x / 6 = 178 / 6 ;

to get:  x = 178/6 = 29 ⅔ ° .

             x = 29 ⅔ ° .