Answer: x = 32, ACB = 32 degrees.
Explanation:
We know that squares have four right angles, which means the sum of x + 2x - 6 = 90. We can write this as 3x - 6 = 90. Plus 6 to each side to get 3x = 96. To solve for x, we divide by 3. 96/3 = 32. x = 32 and so ACB is equal to 32 degrees