book Maths Puzzle Numerical Ability

please help me solve the equation:

x/16 - 5/8 = x + 6/8

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book Other Question

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, Find the LCM of 4 and 7.