Value of x, find it...
AB = AC ....so....
Angle ABC = Angle ACB = (180 - 24) / 2 = 78°
And angle ACD is supplemental to ACB = 180 - 78 = 102°
And since AC = CD....then angles ADC and CAD are equal
So angle ADC = (180 - 102) / 2 = 78 / 2 = 39° = x
CORRECTED...