exam Maths Puzzle Numerical Ability

1/2n-1/8>3/4+5/6n

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Tutor I have the following problem, can you help me? Solve �2 < 2x + 1 ≤ 6

Thanks to you! x minus the square root of -2x+21 = 9.
What does x equal?
Im not sure how to write the radical sign but -2x+21 is whats under the radical sign.