exam Maths Puzzle Numerical Ability

(x-3)/18 = 3/x

I didn't get this problem because it had x squared in it, and I didn't know how to solve. Please help! Thank you so much!

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exam Other Question

What is the domain and range of this equation: x^2+y^2=256 The difference between two whole numbers is 8 and the difference between their reciprocals is 1/6. Find the two numbers.