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

I have not been able to figure out how to do the following problem.
x + 3y =2
x - 2y =-3 30) If f(x)=4x-3 find the following f(-1)

I am not sure how to solve this problem can someone please help me out.

thanks