exam Maths Puzzle Numerical Ability

x^2-9x=0

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exam Other Question

I need help solving Radical Equations, because i dont really understand it yet.
one of my questions is

square root of 5x (no longer under radical) minus 2 equals 3
I wasnt sure how to insert a radicand, so I used/ to represent the radicand I need help with the problem, thank you in advance!

7/45-2/5