To simplify the expression \( w + 3w - 6 + w + 3w - 6 \), we first combine like terms:
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Combine the \( w \) terms: \[ w + 3w + w + 3w = 8w \]
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Combine the constant terms: \[ -6 - 6 = -12 \]
Putting it all together, we get: \[ 8w - 12 \]
Thus, the simplified expression is \( 8w - 12 \).
This represents the formula for the perimeter of each of Miss Yang’s bulletin boards, which would be:
8w - 12