book Maths Puzzle Numerical Ability

I have tried everything i know to solve this problem but i cannot answer the problem correctly please help :
8f-3(f+6)=2f-16

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A family plans to surrond their pool with a patio of constant width. The pool has an area of 150 square feet. The dimensions of the pool with the patio will be 15 feet by 20 feet. Find the dimensions of the pool. A cassette tape costs 13.99 which includes a 6% tax. What is the pre-tax price for the tape? (round your answer to the nearest cent)