exam Maths Puzzle Numerical Ability

Can you please help? I need to solve this problem:

(1/2) + (x/6) = (18/x)

thanks

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exam Other Question

Find the x and y intercepts of the equation.

x^2 + 8x +12 = 0 How would I get an answer for the square root of 1 + the square root of 1 over and over again?