book Maths Puzzle Numerical Ability

I do not understand.

x+2 over x over x-2 over 3x

(x+2/x) / (x-2)/3x

Please help!

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book Other Question

y=4x+1
y=4x-3

i am trying to solve this by elimination, substitution or graphing. i think that if a mult. the 2nd equation by -1, i can use elimination. however, it will cancel Solve for y in terms of x

3x+y=12

How would you answer that question in depth?