Let's carefully analyze Sehyr's work step by step and identify her error.
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Starting with the equation: \[ \frac{w}{2} - 7 = 11 \]
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She added 7 to both sides correctly: \[ \frac{w}{2} - 7 + 7 = 11 + 7 \quad \text{(Correct)} \] This simplifies to: \[ \frac{w}{2} = 18 \]
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However, in the next step, she incorrectly wrote: \[ \frac{w}{2}/2 = 18/2 \] This is incorrect. Instead, she should have multiplied both sides by 2 to isolate \( w \).
The correct operation is: \[ \frac{w}{2} \cdot 2 = 18 \cdot 2 \] So we get: \[ w = 36 \]
Thus, the correct solution to the equation is: \[ \boxed{36} \]