book Maths Puzzle Numerical Ability

can u please show me how to do this problem:


the square root of (2x+5) - the square root of (x-2) = 3

I got the answer of 2, but i believe there is another possible answer,

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book Other Question

What makes Algebra so important? the sum of three numbers is 137. the second number is four more than two times the number. the third number is 5 less than three times the first number. find the three numbers.