Answer: 11
Step-by-step explanation:
[tex]\angle GFE=33^{\circ}[/tex] (linear pair)
[tex]\angle FEB=180^{\circ}-4x[/tex] (linear pair)
[tex]33+180-4x+x=180[/tex] (sum of angles in a triangle)
[tex]33+180-4x+x=180\\\\33-3x=0\\\\x=11[/tex]
