(x•20)•6

To simplify the expression \((x \cdot 20) \cdot 6\):

1. First, we can rearrange the terms using the associative property of multiplication, which states that the way in which numbers are grouped in multiplication does not change the product.

   \[ (x \cdot 20) \cdot 6 = x \cdot (20 \cdot 6) \]

2. Now, calculate \(20 \cdot 6\):

   \[ 20 \cdot 6 = 120 \]

3. Substitute back into the expression:

   \[ x \cdot (20 \cdot 6) = x \cdot 120 \]

So, the simplified expression is:

\[ 120x \]