Answer:
x = 25
Step-by-step explanation:
This is an equilateral triangle as all 3 angles are marked as equal.
Hence the 3 sides are equal
Equate any 2 and solve for x
4x - 30 = 3x - 5 ( subtract 3x from both sides )
x - 30 = - 5 ( add 30 to both sides )
x = 25
As a check on the sides
4x - 30 = (4 × 25) - 30 = 100 - 30 = 70
3x - 5 = (3 × 25 ) - 5 = 75 - 5 = 70
2x + 20 = (2 × 25 ) + 20 = 50 + 20 = 70
confirming that x = 25
