book Maths Puzzle Numerical Ability

I hope this works. I've tried dozens, adn all of them say its simple but dont give me an explanation, A SIMPLE ONE. I would like to know what is the method to solve an equation wh

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simplify the following equation
sqrt (x/3)^2 + (x/4)^2 =

Thanks Jay Dee
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?