To simplify the expression \( w + 3w - 6 + w + 3w - 6 \):
- Combine like terms:
- For \( w \) terms: \( w + 3w + w + 3w = 8w \)
- For the constants: \( -6 - 6 = -12 \)
Putting it all together:
\[ w + 3w - 6 + w + 3w - 6 = 8w - 12 \]
Thus, the simplified expression is \( 8w - 12 \).
So the correct response is: 8w - 12