book Maths Puzzle Numerical Ability

The problem is 6-sqrt x = x. I can figure out that the answer is 4 but what would be the equation?

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I need to find the square root of the fraction 64/100? This is multiple choice A.4/5 B. the square root of 4/ the square root of 5 C. the square root of 8/ the square root of 10 D. 4 to the square root of 2/ 10? Please help me, thank you very much! Hi there-

I have this problem with an answer, but i can't figure out the equation to get the answer, or the mathematical way to find the answer (I use guess and check). If you c