As all the Angles in the Given Triangle are Equal
⇒ The Given Triangle is an Equilateral Triangle
We know that in an Equilateral Triangle all sides are Equal
Let us Equate any two sides, to find the value of x
⇒ 4x - 30 = 2x + 20
⇒ 4x - 2x = 30 + 20
⇒ 2x = 50
⇒ x = 25