Answer:
x = 7
Step-by-step explanation:
Because all the sides are equal in this triangle, all the 3 angles are 9x-3 each.
So, 3*(9x-3) = 180°
=> 27x - 9 = 180°
Add 9 on both the sides,
=> 27x = 180+9 = 189
Divide by 27 on both the sides,
x = 189/27 = 7
