The sum of the interior angles in a triangle is 180 degrees. Therefore, if we add up all of these angles, they must be equal to 180.
64 + 85 + (4x + 27) = 180
176 + 4x = 180
4x = 4
x = 1
Let's check our answer!
4(1) + 27 = 31
31 + 85 + 64 = 180
180 = 180
Hope this helps!! :)