book Maths Puzzle Numerical Ability

I am having trouble simplifying. I know it sounds silly but I have never seen this one or dont remember it. I thought that expanding the problem and elimination would be the answe

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book Other Question

Seven more than the sum of the largest and smalledst of three consecutive even integers is one less than three times the middle number. Find the middle number. How do i do this? List the factors of the number 27.