book Maths Puzzle Numerical Ability

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?

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This question is from Chemistry class "Chemical Equilibrium" -I just cannot figure it out, I've been trying for the last 3 hours to solve it. I will give you the answere as copied 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