exam Maths Puzzle Numerical Ability

PLEASE SOLVE THIS EQUATION FROM COLLEGE ALGEBRA

3/4=1-3X-2/X+1

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exam Other Question

A transformer has 20 primary windings and 100 secondary windings. If the secondary voltage is 25 v, find the primary voltage Here is my question:

6 - sqrt of 20
-------------- = ?????
2

I came up with 6 - sqrt of 5. I am not sure if this is correct. I need someone to let me know if I am doing this stuff correctly, please.