so that small triangle has angles at all edges of 2x because its an equilateral.
So i wanna find angle ADC which means i need too add the angles 4x+ABE+BED+ADC and equate it to 360.
To find BED u know the angle of a straight line is 180, minus that with the equilateral triangle 2x results in the angle BED. For ABE its 130 minus 2x.
Kinda hard for me to explain via text, i'm more of a face to face explainer, hope that helps tho. bambinoswag