Answer:
x = 25
Explanation:
given that the angles in the triangle are equal, indicates that it is an equilateral triangle with all 3 sides equal.
Equate any 2 sides and solve for x
4x - 30 = 2x + 20 ( subtract 2x from both sides )
2x - 30 = 20 ( add 30 to both sides )
2x = 50 ( divide both sides by 2 )
x = 25
As a check
4x - 30 = (4 × 25) - 30 = 100 - 30 = 70
2x + 20 = (2 × 25) + 20 = 50 + 20 = 70
3x - 5 = (3 × 25) - 5 = 75 - 5 = 70
All 3 sides are equal