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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book Other Question

In a football game, the quaterback is 15 yards away from making a first down and is running 264 yards per minute. Within 0.03 of a minute later, a linebacker on the opposite side Combine like terms
3x^3+5xy+x^3-xy