Answer:
Option B, 21
Step-by-step explanation:
Step 1: The value of both PCA and DCW are same
(4x - 4) = (3x + 17)
Step 2: Subtract 3x from both sides
4x - 4 - 3x = 3x + 17 - 3x
x - 4 = 17
Step 3: Add 4 to both sides
x - 4 + 4 = 17 + 4
x = 21
Answer: Option B, 21
