Seesaw dog

A boy (mass \( 30 \text{ kg} \)) wishes to play on a centrally pivoted seesaw with his dog Irving (mass \( 10 \text{ kg} \)). When the dog sits \( 3.0 \text{ m} \) from the pivot, where must the boy sit if the \( 6.5 \text{ m} \) long board is to be balanced horizontally?

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