exam Maths Puzzle Numerical Ability

Will you please help me and show in detail how to do this problem:

5/2x2 - 3/x2+2x + 2/x2-4

Thank you very much

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exam Other Question

I need to find the volume of the cube. Each side is equal to: 2x+1
So in the equation v= (2x+1)^3 I need to find x.
Please help to solve this one.

Solve:

2x+5/2x+3 = x+3/x-1

thanks!